cheap is not something you necessarily want with sub frames. you will have to do prep and weld them in anyhow, so a little more cost is worth it, compared to an inferior product.
my two cents worth. good luck.
DO NOT use cheap subframe connectors, you'll regret it in the long run and they basically do more harm then good especially the bolt in ones. Find some good quality Weld In ones, or make your own weld in unit's, but don't go cheapin' out on connectors. The best connector's to get are through the floor subframe connector's, although they are difficult and time consuming to fab up. I had mine done by a professional for $600.00 Canadian.... Only way to go.