Just caught this deal on TechBargains.com. Buy.com is selling the Dane-Elec 4Gb MicroSDHC card for $26.95 with a $15 rebate. This includes free shipping making this a pretty sweet deal.
The deal expires on August 3rd 2008 so hurry.
If your not up for a rebate. TechBargains also found the A-DATA 4GB MicroSDHC card for $16.99 with free shipping at SuperMediaStore.com with the coupon code HOT25P but that expires on August 1st 2008 (Today).