LP collection

I would comment that the time it would take to find out which are valuable would be longer than if the op took on a full time job for a few months.
The skill to know what is what is learned over time, no place has a 'chart' listing classical values in any major way.
True one can scan eBay listings as a seller. Hoever that is type in a name, then browse a LOT, for each LP.
I would NEVER waste my time doing it.
The one real way to sell records with little knowledge, is on auction. The prices will be better, more stuff will sell at real prices. All the work in the world checking the 'price' is worthless if your listing do not sell.

I realize in a better world the current owner would have time to go through each title and find the ideal price for it scouring eBay sales. After a year of spare time on the project the person would be going crazy...
Then for Goldmine:
(IE stupid prices: Harry Belefonte at Carnagie Hall, in catalogs at $100 per set PLENTY are available for a few bucks. Thousnads of listings are totally out of wack in GoldMine price guide...mostly 1950s stuff no one wants anymore)

Opera usually does not sell has well as traditional classical. I would think bundling opera with classical such as. Audiophile recordings that fitch a handsome amount be bundled along with the opera.Buy 1 get the other free..well almost free. The best to you.

Salvation Army can help you better than any market media you can think of.

Top dollar is a buck each if unopened, picked up. I am working on a buy of 50,000 lps. They are not cataloged. Best guess from prior buys is that maybe 5% have value over $5.00.

Check out Popsike to see the latest EBay prices for your records

http://www.popsike.com/