Will Costco purchase books through Ingramspark? Or do they only use specific distributors? I am aware of the local opportunities to sell in-store, but not how to contact the Book Buyer or where they purchase from.

Petrea & Mark, did you resolve this issue?

I was concerned about the same thing, having initially been unable to get Ingram Spark to accept Croaked, Book 1 in my Edgar Rowdey Cape Cod Mystery series, because its ISBN was already in use. I tried unchecking CS’s Expanded Distribution box (no luck), read contradictory info online, & finally called both Ingram Spark & Create Space for answers. Amazingly, they both confirmed the good news: all an author/publisher needs to do to move an existing title out of CS’s expanded distribution into Spark’s global distrib. is fill out & return the Spark “Title Transfer Responsibility” form. No re-uploading cover &/or interior files, no re-proofing, no re-waiting for days or weeks! Spark immediately takes over sales to (& royalties from) bookstores & online retailers, as well as libraries that order through Ingram. (Libraries can still order from Amazon through Baker & Taylor, but it’s more circuitous & costly.) Amazon (=online) sales of the transferred title, including sales through its CreateSpace store, stay as they were, with CS.

The 2 small drawbacks is that Amazon’s reported sales of that title will no longer reflect sales to bookstores; & for bookstores to buy, you really do have to bite the bullet & opt for the 55% discount.