Yes, we offer $4 per stat after the exchange as a trade in allowance toward a rebuilt order. For every rebuilt stat we require an exchange and then any additional thermostats you send will go toward a trade-in allowance. EX: You send 6 stats and tell us you want 3 rebuilt. We will give you a trade-in allowance for 3 extra. Send your pneumatic thermostats with a note stating what you are sending and what you expect back.