Otter box has Defender cases. I ordered mine from Otterbox. Found a 10% off free shipping coupon code and ordered direct from them as they where the only ones who had it in stock on the day the phone released. The Razr defender case will not fit.
my otterbox commuter for my previous Razr did not work, however, there is an otterbox for the Maxx, already ordered it. Dropped mine about 4 times in the semi during the day, can't be doing that while driving.
I emailed the folks at Diztronics (tpu-cases.com). They will have the Maxx cases available on 2/21. I used one with my Razr and loved it. Just thick enough to help with grip, yet still keep the smooth profile. Ten bucks and free shipping if you order direct.
Smoked in from my Droid RAZR MAXX
Blasted from my smokin hot new Razr Maxx
Motorola Droid RAZR XT912 Shell Holster Combo W/ Kick-Stand
Put the above search on "Amazon's" website. It runs $7.+, not quite $8.00 - want $29.99 on Verizon for the exact same case!! It's like shopping at the Dealer's for your car!! NOOOOOOOOOO!