KMart has 20% off coupons at their pharmacy counter which can be used for the PlayStation 3. Here is the image, some people are having luck using a print out.
It looks like both the 60gb and 40gb ps3's are currently available online, but your local stock may differ.
40gb ps3 $399 - $79.80 = $319.20 + tax
60gb ps3 $499 - $99.80 = $399.20 + tax
Of course you can get it through Sony and get the $100 off - 40gb for $299.
[Source: Sony PS3 Modding - Homebrew, Upgrades, Mods, and Hacks]