If you do an item search on CA, there's three tabs over the results - current items, future, and past auctions.
Doesn't always list all past auctions though, some completed auctions never show. Suspect some of those were super low closing bids like my box of Jericho Hill .44s that I won for 100 flat, never saw it on the list. But my $60 Pudgies did.
Dunno about a third party tracker though.