Starscream, Thundercracker, and Skywarp were all reissued by Hasbro and sold at TRU.

Starscream is the most expensive because he maintained his G1 box style. He showed up in early 2003. On eBay, expect to pay $40 to $50

Skywarp was the 1st G1 seeker featured with the new Dreamwave art. He's a bit more rare because people loved the black color. On eBay, expect to pay $30 to $40

Thundercracker, while still extremely popluar, sold the slowest of the 3. His box was a hybrid between the G1 art and Skywarp design. On eBay, expect to pay $20-ish.