i ordered one from performance offroad center back when they were on ebay...still have a website...but's a 3" x 30'....30,000lb strap...thing has taken some abuse...
I have a standard 3" one. Has seen minimal use but works great. A little pricey, but then again I'm not one to skimp on equipment that gets used hard like this does.
the shackles i get at any industrial supply store for about 11-12 a piece and are rated at 4 tons as well.
wwaaaayyyyy over kill but meh.
also these things get trashed no matter what you do so i'd rather burn through a couple of $20 ones opposed to burning through a few $60 ones you know.