Boring a block is pretty cheap, it's the new pistons that cost $$. Then the bearings, gaskets, etc really nickle and dime you to death.
Mexico or not, make sure you check the machine work before putting the motor back together or you may wind up wasting a whole lot of money. Personally I wouldn't spend even $1K to rebuild a 2.5L, people practically give away 2.5's out of tj's with few miles on them.