Help with value of Elvis Presley picture sleeves and records

I have a bunch of Elvis records and picture sleeves I'm looking to sell and wondering if someone can point me where I can get an idea of value? Thanks in advance

 

Discogs
Ebay (look at sold listings only)
PopSike

 

Thank you

 

Popsike I feel like is the best bet. Using the most recent feature you can see a pretty accurate market value at that moment in time

 

Goldmine. Sells Record Guide. They are on Amazon, but you might be able to find a used copy.

Goldmine | Subscriptions

 

Wanted to append this to my post. There a slew of Goldmine price guides on eBay, all price ranges.

They are published by Krause Publications in Iola WI. I used to work at another printer/publisher nearby in Waupaca WI. Small towns in central WI. A lot of folks worked at both places.

 

eBay completed.