http://tfsource.com/guilty/seeker-weapon-upgrade/
"Product Details

This great add-on kit includes all of the air-to-air missiles for Henkei/Classics version of Starscream, Thundercracker and Skywarp. Perfectly colored to match each figure, this is a 3rd party add-on set not associated with Hasbro or Takara.
Arm-mounted laser rifle *2 (Starscream)
Air-to-air missiles group *2 (Starscream)
Arm-mounted laser rifle *2 (Skywarp)
Air-to-air missiles group *2 (Skywarp)
Arm-mounted laser rifle *2 (Thundercracker)
Air-to-air missiles group *2 (Thundercracker)
Arm-mounted laser rifle *2 (Ramjet)
Arm-mounted laser rifle *2 (Thrust)
Arm-mounted laser rifle *2 (Dirge)"
Price: $40 on TFsource.

$40 actually seems ok to me, as we get the weapons for all three Ace seekers AND missiles, especially since they're made for the United Ace Seeker set. (I think I'm the only OTCA member with one)
Wish they came with those stands though.