I usually check on ebay for some random stuff I have on a list, stuff that might be harder to find or simply hard to find cheap (over here anyway and importing is a joke atm).
Found a local seller with AC Origins Gold still sealed

Auction had 1 day left, start bid was $30aud and no bidders. I checked back the next day and put a bid in the last 5 seconds.
Got it for $30aud
The same time I found a guy selling resurfaced original Xbox discs. I look at these listings sometimes as I have a small pile of good covers/cases/manuals missing good discs (not just Xbox).
Found the first Buffy game for $6aud shipped.