[dinwal]

Are you suggesting that Flippiness should use those services or are you saying that a person can use those services for free without paying?

If latter, yes we could use those but we don't know how frequently they update their prices. If there is a mismatch between their prices and source prices, our data will be inaccurate. We get prices continuously in a cycle for all books that we have (almost a Million). This ensures we remove stale records.

If you meant Former, the issue is a person can't manually check prices for a lot of books every day. Even if they did it will cost them more timewise than our membership dues.