Sell or Trade AR-15 mags in Tucson, Arizona For Sale

I will sell or trade AR-15 thirty round magazines. Sell for $25.00 each or trade for ammunition as described below. These mags. are high quality American made aluminum with stainless steel spring and green follower. In return, I want American quality brass-cased ammo. (No reloads). I can use the following calibers: .22 LR, .223/5.56, .38 Spec., .40 S&W, .45 ACP, .22/250, and .308 Win.
Exchange rate: 1 Magazine for forty rounds of the smaller calibers or 1 Magazine for twenty rounds of .308 Win. or 1 Magazine for 200 rounds of CCI Minimags