.45ACP isn't bringing as much as .223, .308, etc. Check some of the online sites that normally sell brass (I think Cheyenne is one) to see what they're charging. Also check Gunbroker to see what prices are being asked, or possibly you can find the actual price that won the auction. I'd *think* 5 cents a case would be close, but that a WAG.
$45-50 per 500 (without shipping charge ) is a fairly common price these days for no prep work once fired .45APC large primer brass. Some vendors will be higher, some lower, but 0.09-0.10 per piece is about average.