Here are the cheapest ones I could find on Mandarake...
MP3 Starscream USA Edition $248
MP11 Starscream $206
MP6 Skywarp $138 ←worth it!
MP11SW Skywarp $138 ←worth it!
MP7 Thundercracker $413
Hasbro's MP11T Thundercracker $275
There's no TakaraTOMY MP11T listed atm but the last one also sold for $275

Flerken hell these are f'expensive rip-off prices (and it doesn't even include shipping), and they were the cheapest I could find! I'd wait for Version 3 if I were you. The only exceptions are the MP Skywarps which at AU$138 is only about $7 above their original retail prices. The others are so highly inflated I wouldn't even bother with them.