Tough question. Good things come to those who wait. I mean when that thing came out it was retailing for $300. As of now I'ill just settle for the 1GB one for $50-60 to use right now and then spend another $60 for the 2 GB one when it's that price. Just about $20 more and I have 3 gigs worth of memory.
Did I mention you also get $25 in Shutterfly prints for free (10 4-by-6-inch, five 5-by-7-inch and five 8-by-10-inch prints) when you buy it from there. Damn I wish I had money.
And I see my 512mb only fetches about $20 on ebay.