Are uncirculated two dollar bills valuable?

Not particularly. Yes, the might be worth around $2.25 to a serious collector, but good luck selling them. Two dollar bills are easily available in uncirculated condition and even uncut sheets. Really, unless there is something unusual about the $2 bill, it isn't worth much more than $2 even in pristine condition. Of course, I'm talking about the $2 bills from the 1970s onwards, not the "red seal" notes which are much more valuable in uncirculated condition and would command a premium.