What is the best way to sell a record collection?


My dad is looking to down size his record collection down to favorites which he cannot part with. I estimate he has 3500 to 4000 LP and 45’s from the 50’s 60’s and 70’s from blues to classical and everything in between. Does anyone have any ideas how he can go about selling his collection?
dlittlejohn
if you have the time....individually on ebay. otherwise, you buy them from your dad.
Also send me an email, I may be interested in the whole collection only. I do admit that selling piece by piece will get you a better price, but it may not be worth the hassel.
At a local second-hand store, they think they have a goldmine! Several LPs a on display with prices of $500. $250. $60. And they are all pretty common stuff. I guess someone there is 'crazy' (in more ways than one) about Elvis, the Beatles, and a few other tired retired rock stars.
If they actually HAD something worth anything, they wouldn't even know it...
LPs values are so odd! The market is all over the place. LPs sell here at auction for 10 times what they are worth. (I have a mint 2 eye Miles Davis Kind of Blue, paid $8. for it locally, a reissue in the auctions was way over $30. and still going.)