Some of the many resources available for finding prices of collectible records are Music Price Guide and Vinyl Record Fair. You can also check a site like eBay to determine how much your collectible record might be worth.
The prices of vinyl records can drastically change within a few years as collectors' tastes change or certain records become more scarce. Searching for completed auctions can help you to gauge the price of collectible records. If you are unable to find prices through online resources, you may be able to ask the staff of a local record store for help pricing your collectible records.