Where I can get back part of Shure mic?

Hello, a friend gave me Shure Beta 87A/SLX2 mic. It works fine, but it missing an receiver. Receivers are costy and I don't need it anyways. But as I can checked, this mic consists from two parts, Beta 87A and SLX2, and top one can be just unscrewed from the bottom part. Now is the question, where to get the bottom part, which is wired and won't cost me an arm and a leg? :)