WHOA Big fella! Let'* take a little closer look here:
1) They're not $150; they're $135.95 if you want to wait a week for the endlessly-repeating "auction" listing to expire, or $155.95 for Buy It Now.
2) The Shipping and Handling by Priority Mail comes to a whopping $35.85 to the Chicago area, and probably elsewhere as well. That'* enough to mail a 29-pound package! Even 15 pounds can go Priority Mail for less than twenty bucks. Looks like there may be a little more Handling than Shipping going on here; how expensive should it be to slap a mailing label on a factory-packed alternator box?
I'm sure they'll have the right size for the Bonne, but I'm a little skeptical about how great a deal this really is when it'* all said and done. If you open the box and they've goofed something up, or flat-out sent the wrong one, or it turns out to be a refurbished one or something like that, it'* a long way back to Miami. Aren't there any other AC-Delco outlets near you that could beat those prices? After all, you're not trying to locate vintage parts; you're ordering new ones that are being distributed nationwide through all the usual channels.