I think I bought the last two (4GB) newegg had last night, because they went out of stock right after my order
As for where you can get them: good luck. I tried looking around a bit to help you out, but it seems like everywhere they're out of stock. Monarch computer is citing an "industry shortage", and their ETA is 9/1. I went to almost all of the sites listed on froogle, and they all show it as out. TigerDirect seems to have fully pulled it.
P.S. my credit card company just called me about my order with newegg last night - apparently it was larger than my normal spending pattern, and they wanted to make sure it wasn't fraudulent. lol. (I bought a bit more than the memory...)
Edit: as OCNewb points out, zipzoomfly appears to actually have them in stock... I would grab them ASAP as virtually every other store out there has sold out.