I just got a mini van for June 1-9 thru Dollar for Total of $325. That's with no codes. I put in a couple codes in in but they came up as same price. I was getting $500 for rentals so I'm happy for this, but I will keep looking.
I also got a full for a total of $190.
Don"t know if the additional driver is important to you because Dollar charges $10/day extra. With Budget it is included and using BCD x474200 and E-Coupon MUGZ029 for $30 off the total inc taxes is $329 after coupon is applied when return minivan.