Typically, a Compact or Economy car for 8-9 day trips costs me about $120-$160. The cost varies from year to year, season to season, and company to company.
For my upcoming trip I got a great deal - a Mid-Size car from
Alamo for 9 days for $122. I used a discount code and an additional $20 off coupon from Sam's Club. The undiscrounted rate would have been about $150, which is still pretty cheap for a mid-size.
Keep in mind that there are 6 rental companies located in the MCO garage - Alamo,
Avis,
Budget, Dollar, L & M, and National.Usually these companies cost a bit more than those off airport property both for the convenience factor and because they pay more rent.
But deals can be had. Check on MouseSavers.com regularly for dicount codes and tips, and check any warehouse clubs like Sams or Costco that you might belong to for thier coupons.
And remember that the major rental companies don't charge deposits or cancellation fees unless you cancel within 48 hours, so you can make reservations anc changes them several times if you need to whenever a better deal comes along.