I would do the alignment first. You can easily cause bad wear on a new set of tires in a few days if it is way off, and it can be off even if it does not pull to either side.
Check the mechanics listed in the files here, and call and ask if they do a four wheel alignment. If not, check elsewhere. If your model does not have rear adjustment, ask if they can shim it into spec. Again, if not, try someplace else. A good alignment shop can do all the above to get everything within spec.