This week I found a seller on eBay that sells FD&C Red 3 (Erythrosine) powder. She swears it is the pure food grade dye with no other ingredients, $6.00 per oz. I'll report back if it works or not.
Also, google Magnacol and try them for dyes. They are out of the UK and sell small quantities of all sorts of dyes erythrosine, rhodamines, eosins, for reasonable prices. No cyanines though. They are on ebay as seller "scuddlebutt3." I got my current batch of erythrosine from them.