I suspect you're in the US but for Europeans whiskyauction.com is interesting. See https://whiskyauction.com/cgi-bin/auction/auction.pl?action=Go&category=Highl

I suspect you're in the US but for Europeans whiskyauction.com is interesting. See https://whiskyauction.com/cgi-bin/auction/auction.pl?action=Go&category=Highland%20Malt%20A-B https://whiskyauction.com/cgi-bin/auction/auction.pl?action=... for Aberlour A'bunadh for instance. I don't know anything about price differences between EU and US.