I just got my Sandisk Ultra II 4GB last week for $90 at Alan Photo SLS. They may quote you a little bit more but you can bargain =)
You might want to check this page http://www.robgalbraith.com/bins/multi_page.asp?cid=6007 first to see if it is actually worth paying more for the Extreme III over the Ultra II. In my case (Canon EOS 20Da) the speed difference is negligible, and I save about $30 (I think).
Good luck!
oh thanks, got 4 gig extr3 for $117 few months ago... thought price will go down more...n get few extra ones... since no change, will wait a while longer.;p