Are you always going to run these on 120V? You could probably buy the transformer from the 120V model and swap them out, but then you're committed to 120V. It might sound like a good idea to have both transformers on hand and swap them for whatever you need, but it's really not.
ADDITIONAL INFO:
Part number for the 120V transformer is 105068/803 (120V 60Hz), you might be able to order it straight from Clay Paky America, if not PRG will be able to get it.