Ebay. You can get one for US$300 or so.
i am not sure about the rest, but these three below: Camera -> i am satisfied with it, went holiday once with it and took almost the same amount of pictures as with my DSLR. guess why. source for purchase -> i think you can buy in many stores, even at Amazon. depends on which country you're in... in Europe this is not true. 600Mhz -> never a problem as long as it does its job well. no use if sluggish if you have 2Ghz running. just my 2 cents. wahlau.