Avis car rental has great rates for Chabad.
Avis is known for their great customer service & superiour cars.
The corporate number is:
X192286
Enter this code as the AWD # on the 1st reservation page.
Also available is coupons for additional discounts:

$25 off a weekly rental (from airports) code MUWA002
$30 off a weekly rental (5 days+) code MUWA130
$25 off a one way rental code MUWA193
$15 off a 3 day weekend rental with code MUWA158
$20 off a 4 day weekend MUWA159
Free upgrade - UUWA055