Now we have two revealed for this year, and a third still only hinted at.

Devastator - price unknown? (probably about US$180-200 - the regular one is US$150)
CW Hunters 3-pack - US$75
Kreo (unknown) - price unknown

That should hopefully be all of the Transformers exclusives for this year, and SDCC is only about 5 weeks away (July 9-12), so start saving up those pennies if you are keen on any of them.