Dealers 2023

Note: This page is an archive from COSine 2023 (January 20-22, 2023). Check the main COSine page to find details about the next COSine!

Not only will there be a ton of cool stuff available in the dealers room this year, but if you play your cards right, you might win some COSine Con Cash that you can use to buy goodies in the dealers room (or art show)!

2023 Dealers & Authors’ Row

4 A Custom Keepsake – We produce custom photograph items and t-shirts, things like putting photographs on slate, glass, aluminum, tile, and 100’s of other items. We can make custom t-shirts with nearly anything on them.

A.L. Kessler – A.L. Kessler is an author of paranormal and urban fantasy books and is best known for her “Here Witchy Witchy” series. A self-proclaimed coffee addict, she resides in Colorado Springs with her family and menagerie of animals. When she’s not writing her next book, she loves to read and visit with friends and family. To learn more about her, check out her website:  or follow her on Facebook here:

Adam Gaffen, Author – Adam Gaffen is the creator of the popular and critically-acclaimed near-future science fiction series, The Cassidy Chronicles. He is active in the independent author community and gets to as many conventions as he can. In addition to writing, he is also an editor.

Alastair Mayer – Books (novels and anthologies) featuring stories set in Alastair Mayer’s T-Space (terraformed space) science fiction series.

Andrew D Meredith – Andrew D Meredith, will have his SPFBO8 Semi-Finalist book “Thrice” and the first two books of the Kallattian Saga “Deathless Beast” and “Bone Shroud” available for sale, as well as the first three books in the “Spokane Clocktower Mysteries” by Patricia Meredith.

Author, Author! – We work with authors for promotions, signings, fairs, conventions and conferences.

Dark Silo Press/Piston Valve Press – Two micro-publishers with Steampunk and horror titles for sale. and

Green Griffin Press – Vennessa Robertson runs a large and small animal sanctuary in Elizabeth, Colorado when she is not homeschooling her children. She is the author of the Arcane Adventuress series, a highly enjoyable Victorian paranormal adventure and the StarHawks series, a thrilling futuristic military sci-fi series. Both her series star strong female characters and deal with humanity and heart.

Hearth Witch Crystals & Botanicals – Hearth Witch specializes in handmade goods of all kinds! From candles and oils to jewelry and divination tools, we have everything for your witchy or book loving pursuits.

Henderson Infinity Press – Great Science Fiction Books — Mantis Saga, Viper, etc.

K.J.’s Jerky – Tasty artisanal jerky! No MSG, Gluten, or Sugar. Natural ingredients! Just you the meat and flavor!

Knight Writing Press – Knight Writing Press will be presenting publications from Knight Writing Press as well as a few other authors.

Loridian’s Laboratory LLC – A publisher that publishes Michael Kilman’s books.

Marie Whittaker – Marie Whittaker, author. Superstars Writing Seminars, craft and business conference for writers.,

Peter Sartucci & Friends – Author book sales, all written by Peter Sartucci and a selection of friends.

Poppin’ Off Creations LLC – Traditional Arts & Modern Crafts

Primordial Pals – Original art dinosaur goods

Reworks Massage and Tech LLC – You may not know it yet…But there’s a gremlin loose at COSine this year! He hides in the floors, in the chairs, at the tables; slowly, slowly sinking into your feet, legs, hips and back. He sometimes even finds you in your guidebook, notepad and, yes: your cell phone!
Defeat this gremlin of pain, discomfort and con-killing displeasure with an Out-of-this-World chair massage with the Massage Wizard! Gamer back? Gone!
But how, you may ask, do I find such a Wizard? Well, my friend, with the magic of your cell phone! Book online at or call/text 720-295-8131!

Robert G. Williscroft – Author of hard SciFi and Submarine Technothrillers

Rockhound Studio / Beauty and the Beads – Rocks, Rock Art, Geode Cracking and Handmade Jewelry

Rogue Publishing – Rogue Publishing is home to rip-roaring action packed space opera stories.

The Ashport Archives – The Ashport Archives is a four-book complete urban fantasy series featuring a ragtag group of mythological misfits banding together against forces that would tear them apart.

Vipi Ink – Statement pins for statement people! Vipi Ink makes pins packed with effects, and matching themed accessories including washi tapes, stickers, charms, and more. From the smallest leaf to the largest planet, this shop has something for every collection!

Viridian Tea Company LLC – Loose leaf tea company – blends inspired by books, art, music, and science.

Who Else Books – We specialize in science fiction and fantasy books, especially by regional authors and authors attending COSine. Also, steampunk, zombie and vampire books.,