This just came today from Amazon:Autool BT-460 Automotive Battery Tester
Many different sellers had this same unit, some for twice the price. So I went ahead and ordered this one. Much to my surprise, at checkout there was another $9.30 discount! $23.43 out the door sounded great to me, and on top of that the seller shipped it NEXT DAY UPS! The shipping alone had to cost 3 times what I paid for the unit!
I tested it against our nicer battery tester at the shop, and it's perfect. Same readings within a couple percent.
Hopefully this is useful for anyone who just wants an inexpensive battery tester around the house or for their personal use at work.