While the meximelt has officially been retired from the Taco Bell menu, I have found an ingenious little work around. If you order a beefy mini quesadilla w/ added pico, you get what is essentially a meximelt with a little extra zing. And, it's less than half the cost of the original meximelt, which was the most overpriced thing on the menu at Taco Bell.
So, crisis averted! You're welcome.