any tips on how to save money on mailers?

[Will Sifert]

Just starting out in wholesaling and have narrowed down a list of potential sellers I want to contact in my area. I am about to send out a couple thousand letters but I haven't bought stamps in years, what do they go for these days .43 ?

Is there any cheaper ways to do this or buying a lot of books of stamps pretty much my only option? any bulk rates or anything like that?