3. Barnes, Hornady, and Nosler all have lead free bullets. The most popular is OF COURSE Barnes. Hornady has the GMX line, they are monolithic bullets made using guilding metal instead of the pure copper of the Barnes. Nosler has the E-tip, which is also a solid guilding metal construction.
I don't know if they offer a 150 grain from their line-ups. But they should be able to come close to that weight.
Hornady has one;
Barnes has one;
and so does Nosler;
Looks like a good selection, none are exactly cheap though!