On TuYo, the largest t-Mobile reseller, you've got a Sony Ericsson z310a (review coming sometime in the future) for $90 (ech), the Motorola w220 for $50 (meh) and the Nokia 1208 (review coming eventually) for $30 (hmm). Rates are good, though; text messaging is a scant five cents per message at this point. You can also, for $5, get no-extra-charge calling to Mexico, Hondouras, Guatemala and the Dominican Republic. Finally, Club MAX is out, a loyalty program that is at least halfway decent. $50 in refills gets you a $5 bonus, another $50 gets you another 45, another $100 gets you another $10 and a final $100 gets you $20 additional added onto your account.
At that point, you're a TuYo VIP. Problem is, I'm not quite sure what that means. The website isn't set up to tell you, either. What I did find out though is that, for $3 per month, you can get 100 text messages per month, a decent discount from the already-cheap 5 cents per message on pay-per-use texting.