Earlier today we showed you an interesting deal on an unlocked Galaxy S3 version (the GSM GT-I9300 model that doesn’t have LTE support) that sells for $499.99 on eBay, but not every Android buyer out there is looking to purchase a flagship handset at full price.

And considering that the Galaxy S3 is already six months old, there are definitely other on-contract deals to take advantage of, such as the following Radio Shack’s BOGO (buy one get one) offer that starts on Sunday.

The company is going to offer you a $99.99 Galaxy S3 (with a new two-year contract with either Verizon, AT&T or Sprint) and a free Samsung Android handset to go with it. Naturally, that second phone will also have to be paired with a new two-year agreement, but that second phone is certainly worth buying.

You can choose from either the new Verizon Stratosphere 2 or the “old” AT&T Galayx S2 Skyrocket and the Sprint Galaxy S2 (Epic 4G Touch).

The offer is available to new and existing customers, and there are other perks included. As long as you purchase the Galaxy S3 in a Radio Shack store, or you activate it with Verizon or Sprint via Radio Shack online, you’re eligible for a $50 Google Play credit.

On top of that, you also get $10 cash-back coupon for every $50 you spend with the retailer, so you only need to spend a penny more on top of that $99.99 Galayx S3 to receive Radio Shack coupons worth $20.

If for some reason the Galaxy S3 BOGO offer does not appeal to you, you’ll be able to replace the Galaxy S3 with the RAZR 4G LTE. In such a case, the second free phone will also be a RAZR 4G LTE.

Are you ready to take advantage of this Radio Shack offer?