Ok I finally found my package. It's not Solvy, it's (oddly enough) C&T Publishing. 25 sheets, printable, water-soluble, single-sided fusible. The package says $15.95, I can't remember where I got it or how much I actually paid. I have not personally tried it yet, I plan to use it for an applique project that is next in line. However, I have a friend who used it for a hand-embroidered quilt she made and she demonstrated a sample of it for our group - she printed it, sewed it, dissolved it in a pan of water. Her project turned out beautiful and soft.
http://www.ctpub.com/productdetails.cfm?PC=2385