Here's a suggestion that really shouldn't be laughed off:
Go to Pep Boys and get a set of Futura Dakotas or Enforcers. The Dakota is kind of a BFG AT copy and the Enforcer is kind of a BFG MT copy. Either way, they sell for $80 or less in sizes up to 33". The Dakota comes with a 50,000 mile tread wear warranty and I think the mud ones carry 30,000. All of their tires are made by cooper and I have know a few people with them and have never heard a complaint.
Other than that, there are all-terrain and mud-terrain Generals that are good tires with good prices. I think that the Grabber ST is mostly a street tire, but I have assumed here that you want to get a little more off-road traction.
If you're not sure what size will fit, most tire shops will mount a set up for you and let you drive around a little bit to see what hits and what fits. This is a good thing to do since the actual sizes of tires varies a lot from the rated size from brand to brand.
'85 JIMMY
'90 paint/grill/trim 5"susp 33/12.5/16.5
Fresh 350 B&M '87 TH700