My date checks were for a three-day rental (June 6 10am to June 8 8pm and June 13 10am to June 15 8pm), which partially explains the difference (yours is probably a two-day rental). I've already closed the windows, but I think the first weekend's cheapest car was about $45/day through Enterprise and the second weekend's cheapest car was about $75/day through Budget. (I searched on Travelocity, which shows all companies on their grid, whereas Orbitz and Expedia tend to only show "preferred" vendors--i.e. vendors that pay higher commissions to them.)