Surprise, surprise. The Garmin-Asus Garminfone has dropped in price. Again. But this time, it appears to apply only to existing T-Mobile customers. Tmo has sent out emails to existing customers, informing them that they can now pick up a Garminfone for only $99 (with 2-year contract & $50 mail-in rebate), meaning they get an instant $30 discount. This may be a special promotion or a last ditch attempt to sell as many Garminfones as possible, but it doesn’t look like we’ll be seeing this GPS-laden Android phone much longer.

This is somewhat startling, considering that we covered another price drop just 3 weeks ago. The navigation-savvy device is declining in popularity faster than expected. T-Mobile may not like it, but the Garminfone is going downhill. Fast.