You can also check the classifieds here as well. Not sure how many will have babies now though, that will be ready to go end of May... being live bearers, not sure when the bulk of breeders have babies available. The breeder I bought my two from usually as babies in June if I recall correctly. But she's Canadian so may not be of any use to you, if you are not Canadian. If you are Canadian, feel free to send me an email (just click on my nic and you can send me a message that way) and I can give a list of various Canadian breeders and sources I know of which could help you get a blue tongue.
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PHLdyPayne