Only problem is, we live in the lowest price society...
Go to any parts store, and they can give you options on prices, and most people take the lowest one.....
But even the higher priced ones are no guarantee......anytime anything is rebuilt, it becomes a crap shoot.....
Always make sure whatever you buy, has a decent warranty, to cover a possible problem...
Starters and alternators....you have no idea of what the quality of the rebuild is.....you luck out, if the R&R is easy.....i.e., some alternators you can replace in 5 minutes, like one on a GM 3.8 motor......but something like a GM 3.4 double overhead cam engine, will take you over two hours, and the swearing begins when the replacement doesn't even charge......believe me, it happens.....