The next time you're out shopping for toilet paper, kitty treats, motor oil, and a gigantic jar of pickles, you can add a G1 Android-powered smartphone to your list and save money on that too, all without ever having to leave the store. That is, provided you're shopping at Wal-Mart.

Starting Wednesday, the mega-chain will begin selling the G1 phone to both new and existing T-Mobile customers in 550 of its stores, but there's more reason to buy the phone at Wal-Mart than just convenience. According to Wal-mart spokeswoman Melissa O'Brien, the G1 will run $149 for new customers, or $31 less than what you'd pay T-Mobile, who's selling the same phone for $180.

For those of you just coming out of a coma, the G1 is the first Google Android-powered smartphone on the market. Demand for the phone with an open-source OS has been high, with an estimated 1.5 million units already sold through pre-order sales.

Plan on picking one up? Hit the jump and sound off.