Just in case $39 was too much at a T-Mobile store for the Nokia Lumia 710, you can head to your local (har har) Microsoft Store and pick up that bad boy for the low-low price of FREE. Of course, they're just not throwing free phones at customers as you do have to commit to a 2-year contract. But hey, that's not a bad deal.
And since the chances of you actually living near a MS store are a bit slim (you can check here though), you can also order by phone or online, making this a pretty good deal to share with others.
Source: Microsoft Store Online; Thanks, Justin W., for the tip