JCwhitney,...have not really thought of them since my VW days either....20 plus years ago.
subaru dealers:
recently been buying from Heuberger in colorado,
came up cheaper even on sales weekends then Quirk in Mass, and subarupartswarehouse of CT
and Amazon subaru dealers for maint items. (like OEM filters)
for generics: Rockauto is pretty good, (but check that inbound mail / freight charge).