Go to hertz.com - they have lease-buster specials starting at 499/mo for as many months as you need it, provided you pick up the car before March. There is also a 100/off coupon you can use.
Avis has nothing to match coupon wise - I couldn't get my local Avis shop to match the Hertz offer, so you're better off dumping Avis.
Sorry about your job
https://www.hertz.com/rentacar/speci...TabLink=tlink1
Rate code is MMFL
Add this coupon:
Save $100 on Monthly Rentals
* Save $100 on monthly or multi-month rentals
* Valid through March 31, 2009.
* Promotion (PC) Code Number 123325.