When you've got regular versions that seem to be as popular as exclusives, that will make this line pretty hard to come by down the road, IMO. This is the first line outside of Marvel that I've noticed this much enthusiasm. You may have one turtle that may be easy to get, but most collectors will want all 4. Exclusives aside, as it is now, good luck in finding the regular Donatello for retail price or anywhere outside of ebay.
Waiting for whatever reason will mean paying higher prices in the future.
Waiting for whatever reason will mean paying higher prices in the future.