I'm in the process of a BBP swap with front disc brakes. I pieced it together to lower the sticker shock. If you can get used spindles and control arms and caliper brackets the cost is significantly lower.
I have some big bolt pattern ones off of ebay that I'm going to try hopefully this week. I already know I had to grind a couple spots so that the caliper brackets that came with the spindles would fit.
Been pricing a kit vs. individual parts from the parts store and ebay and its cheaper piece wise. plus you can do it over time less sticker shock. Oh and parts store warranty.