I got a idea
What if you set up a college fund (really is more like fish tank found) and tell your work to take off $50 form each pay check and direct deposit it in to the account.
All you have to make sure is play with the amount of money a little bite so the wife don't know about it
I hope it works
Cheers
P.S: is there a book out there that can teach us how to get the other party hooked on this hobby?