I really hope you can still get them from TTG's store once their warehouse relocation is done. I'd say wait another two weeks, then check back here. They said that pending orders would be processed in August, so I expect the merchandise store to be back up in August as well.
So don't head to Amazon immediately. You'd be better off here.
/edit: Interestingly, Amazon.com hasn't got the Season 2 soundtrack at the moment.
The Season one OST is available, AND seems somewhat reasonably priced. You may still want to wait, as - who knows? - you might be able to get a bundle price from the TTG store in August... possibly even for three instead of two soundtracks...