What genres are you buying?
I remember the vinyl scene on ebay got really hot around 2000-2002ish. Everything was overpriced and people where bidding silly amounts on crate filler type junk. I remember looking on ebay a few years ago because I was thinking of offloading my collection and it was an entirely different ballgame. Now with all the DVS systems and Controllers, not many are looking for vinyl.... Just some genuine packrat collectors and hippies wanting to look cultured. Gone are the days of Thursday night new releases at Play De & Traxxx.
Anyway, I think discogs is a pretty good place to look nowadays as far as online shopping goes.
The last record I bought was on Record Store Day at Play De Record.
I'm mainly focusing on classic rock LPs now. Stuff like Led Zeppelin, The Beatles, The Police etc. I'm also buying modern rock stuff like U2, Coldplay. I don't buy often though. I usually just rummage at yard sales or markets. I get lucky once in a while. I scored a Pink Floyd - The Wall for $5 recently.
Oh man, that's memories. Thursday night were mental at those shops. They would lay a track down, then a bunch of people would stick out their hands for copies. I burned a lot of money down there in the 90s. Had beatport and serato existed then, I'd be living large today.
You're right about discogs. I totally forgot about them.