V8 or V6 into 87 b2000

I am wanting to put either a 4.3 or a 350 chevy in my mazda. Does anyone know where I could get either one of these mounts for a mazda swap? I have went to ultimatecustoms but they are in canada and they are $160.00 US. Does anyone know where I could find some cheaper ones. Any info will help tremendously