Discogs is a fantastic online record store and vendors that often are record stores across the world, or collectors that buy and sell vast quantities of records. I also use it to track my collection, which helps when cataloguing which release I have and provides additional details about the pressing.
I initially made a lot of purchases on Discogs to build out my collection, and its fantastic at that; the prices are often lower than what you would find in record stores, or good for hard to find releases. And browsing/combining records to save on shipping is fun while deliveries are nice to receive. However, you can sometimes buy so many records that you deprive yourself of the store experience and digging for good finds. That might be a terrible way to spend time for some people, so if that’s the case Discogs is a great resource for you!
This was my first purchase on Discogs, and the experience was good. You have to rely on descriptions for the state of many records, but you can’t always tell if a record will play flawlessly by sight either, so its a crapshoot sometimes. Just be sure to acquaint yourself with the Discogs grading guide when you purchase records.