US Postage Stamps

[Stephen De Vita]

Hello, 

I am not sure if this is in the correct place to post this. I am buying multifamily properties and reaching out to owners. I am sending 300 letters every 4-6 weeks. I was told getting USPS forever stamps is the best route. However they seem a little expensive even if I get them at Costco, a pack of 100 is about $72. Does anyone know a better deal for stamps? They have to have the US flag on it. If you have any other ideas I am open to hear them.

Stephen