I mostly rented avis. and ususally in the the one on yirmiyahu
I did have friends that got upgraded nicely by hertz... but it all depends on the time you rent how busy it is, what they have avail...
If you want cheap, reserve a manual, and u'll deff get a automatic at the price of a manual (avis)
Look at the prices at budget.com - it might be much better (i saw the automatic getz for $7 b4 insurance)