ther a plethora of choices to choose from.
Classics
United
Generations
3rd party
you can check all the options at:
https://tfwiki.net/wiki/Thundercracker_(G1)/toys&
https://tfwiki.net/wiki/Skywarp_(G1)/toysthere are even a few in other lines
for example: Cyberverse, Prime, etc...
but if you want a match to your SIEGE STARSCREAM,
just wait a few weeks!
has already announced a Thundercracker in the works
and where there is TC, there is inevitably SW.