How much would the labor cost for my lower ball joints is I but my own parts?

this is on recall

Most shops will not allow you to supply parts there labor rate is based on them making profit on parts and if the parts failed the law says they carry the burden of warranty even though they didn't supply the parts. Labor guide says replacement of upper ball joint is about 1.3 hours, lower ball joint replacement is just over an hour.

A ball joint and a ball bearing are two different things. Since you apparently were unaware of this, it is likely that you would have difficulty getting the right parts. I would leave it up to the mechanic, but he will probably mark up the price of the parts. This is how mechanics make part of their money.