Another choice might be the rebuilder with perfect feedback located in california. Perfect feedback is hard to earn in that field so he must be serious and pretty competent.
His prices are usually 59-69 for alternators and you supply no core. He first attracted my attention with his 69.00 rebuilt 123 mercedes diesel starters. Again with no core required. His shipping is reasonable as well.
On a somewhat more sertious note. One ongoing problem in the starter/alternator repair business is the poor quality of aftermarket replacenent parts. It is just hard to get good replacement parts of reasonable quality for rebuilding/repair purposes at reasonable prices. Although some repair/rebuilders still try. An example is the regulators for 123 alternators. The bosh are still pretty good the off brand regulators are of questionable quality.
Disclaimer: I have no business connection or other interactions with this guy. Not even any involvement with his wife.