We got some deal for around $240 (including tax i think) for a minivan with Avis for nine days (we'll be there President's week too!) - however I'm not sure how we got this deal, as my job was accommodations
We have a full size rental from Avis for $185 + tax for Easter week... not the cheapest we've ever gotten, but considering its a peak rental time I'm not complaining...
We have a full size car from National Emerald aisle for $198.94. This is for 2/22-3/1. I used the Emerald Aisle contract ID and a coupon10008198 which I found through a link from mousesavers.com and this coupon was on National' web site ($15 off a weekly rental)