Meritline offers the 5-LED Multifunctional Bicycle Rear Tail Light for $2.99. Coupon code "MLCK207NL1" cuts it to 99 cents. With free shipping, that's tied with our August mention and the lowest total price we could find for a comparable light by $2. It features three flash modes and includes a belt clip plus a quick release bracket.
Expect this item to take two to three weeks to arrive.