Some of the Tracfones are even cheaper than usual...
At Dollar General the Nokia 2126i (the new Single-Rate version) is $15, albeit with no included airtime (versus $30 with 60 minutes included).
And at K-Mart (thx Turk) the Motorola c261 looks to be $30 (whoa...cheap cameraphone!), with the grey-haired v170 down to $25.
Keep the price cuts coming :)