I don't know how I missed this yesterday in the Best Buy ad, but apparently I did. It looks like T-Mobile is launching prepaid BlackBerry service in the US. Well not the entire US, to be more specific, New Jersey only right now.
Hopefully T-Mobile will have as good of price or better than what MetroPCS has offered to their customers. Details are sketchy, but if you live in New Jersey please post up some info in the comments about what you've heard about this.
** Update ** Getting some word in the comments that the above ad stating these are avilable in New Jersey only may not be accurate. Seems to be available in other states as well. Keep the comments coming with more info.