I have a few air planes/piggy banks from texico collectors i think how can i find out how much they are worth?

Most people try to sell them for about 30 bucks or so. However, on ebay, unless you have something rare (you don't) you wont get more than 10, and more likely 7-8 fort each of them. Unfortunately, they are available almost everywhere, and even still from some fbo's who have a ton of them they can't give away