$30 · four Vintage Tonka fire trucks

Hello there I'm looking to sell my four vintage Tonka fire trucks. Getting hard to find these now and they will definitely appreciate in value. The smaller one is definitely older and the smallest one is early 90s they are all very collectable. These toys were built to last and they don't make them like this anymore. Down sizing my collection to move and it's tough to let them go because I really like them but I think that $30 is a fair price for all three. Thanks :)