I doubt there would be enough money saved to justify getting an alignment done now vs. later you'll replace the tires in 6-8 months. Around where I live, advertised deals on alignments start in the range of $40-$50.
I'm not especially knowledgeable on the subject, but I suppose being out of alignment puts a little extra stress on the wheel bearings and CV joints, and also various joints such as where the tie-rods and stabilizer bar join the wheels. But my guess is such added stresses are pretty minimal. The tires are where misalignment has the most pronounced effect in wear by far.
When you get an alignment done, it probably would be a good idea to spend a few extra bucks and get a 4-wheel alignment (if you have 4-wheel or rear wheel drive, for sure the shop would do a 4-wheel alignment.)
The criteria for judging the competency of a shop's ability to do an alignment are the same as for any other type of car repairs. You're best off knowing the shop's reputation before taking it in. Of course that's not always possible. It's a business with plenty of slippery hustlers in it. Also, most shops that do alignments probably use very similar equipment.
If a shop touts the benefit of pure nitrogen inflation for car tires, that's one clue that they may not be honest folks. Where I live, nitrogen inflation is being promoted these days in radio ads as beneficial. Bunk, IMO (and I'm a Mechanical Engineer.) Air is already 78% nitrogen. Any benefits in filling tires with pure N2 versus air are so small as to be negligible.
Mike