T-Mobile.com has temporarily marked down the prices of three prepaid phones. This is a "limited time offer". There's no stated expiration date but T-Mobile's limited time offers usually only last for two or three days. Here are the deals:
Nokia 1616 candybar $14.99 (reg $24.99)
LG GS170 red flip phone $24.99 (reg $49.99)
T-Mobile Sparq QWERTY slider $29.99 (reg $49.99)
T-Mobile.com is also having a one day sale on the Samsung t359 :) "Smile" QWERTY slider. Today (12-Dec-2011) only the price is reduced to $50 (reg $74.99) plus you get a free $30 refill included with the phone purchase. Update: it's only 8 PM PST but the "one day" sale has already ended. The Smile is back up to $74.99 with no free $30 refill.
The sale phones are rather basic feature phones. If you are looking for a smartphone, the refurbished LG Optimus T Android phone is back in stock at $129.99 ($179.99 if new).