What are the main websites and forums where fans exchange info about where online to buy anime/manga collectibles from Japan (such as trading offers/requests, current auctions, recommended online shops, wish lists)? In particular, for hunting down/notifying about chances to acquire out-of-print merchandise such as for series which have already ended.
When I used to buy anime/manga collectibles made in Japan about 15 years ago, many fans were on email mailing lists (based on subjects such as shoujo anime, or specific series) where members would, from time to time, post links to trading websites and eBay auctions of interest, or share if they had found a reliable shop or proxy buying/bidding service, but I think this sort of ML is not very popular these days. Where is the Go To place for most fans to share info about anime/manga merchandise that is currently for sale? I came across http://myfigurecollection.net/ but I have no idea of whether this is a main site for this kind of interaction or whether there are more popular ones.