Kate, I'm up near Sacramento, but had absolutely NO luck finding commercially available guppies here. I eventually picked up some adults from an individual who wanted to thin her group down. Fry do come fairly quickly, but take some time to get big enough to feed. Couldn't hurt to try Craigslist.

Goldfish aren't good choice, especially for babies, because of thiaminise issue.

How old are the babies now? Have they eaten anything at all yet?