I googled a bit and got a hit on HP Scanjet 5530, which is quite bulky.
This HP 5530 scanner has a built-in Auto Photo Feeder (APF) that can take 20 photos of 4x6 size in one go. Unfortunately, user reviews seemed to indicate the APF was not quite reliable and caused many jamming incidents.
Shopper.com showed two vendors have the 5530 in stock. A refurblished one costs $215 and a new one costs $270