This is an impossible question for me to answer taking into account all the ways people buy and sell albums.
However, here is how I value the records I collect.
I start by searching completed auctions on ebay. Ebay, for me, is a good place to review current real market values. I check the completed auctions and compare the number of copies on the market, prices and what copies have and or have not sold for.
If you do not see your album listed on ebay at all, that does not necessarily mean that you’ve got a rare and valuable record on your hands. You may have an obscure record with limited appeal to a small number of collectors.
If I tell you your album is worth $10, but then you find your album listed online for a higher price? The answer is that prices are fixed for an entire host of reasons which are not tied to real market value.
There are a great number of online resources to search for values, including gemm.com, amazon.com, and esty.com. Many record dealers also have online storefronts. But, again, prices will be all over the place. Some prices will be absurdly high. Buyer beware.
Now, I back up to the issue of rarity vs. obscurity. I blog few rare records. I blog obscure records. Some record stores I visit don’t really know what to do with the records I like to collect. Some dealers discard or refuse to buy the records that I value. Other dealers, both online and brick-and-mortar sellers, over-value the records I enjoy. I've noticed copies of albums I fine interesting literally sit untouched in record stores for years. What this tells me is that the some records are obscure and valued, but by a select few collectors who value them differently. So, if you see a copy of a record on a blog, that does not mean that the record is a pricey collectible (although it could be).
You will also need to consider the condition of your album, but that is a different can of worms that I'll leave unopened for the moment.
