Got them all at the same place. The 14mm is pretty massive - it was probably more expensive. But a lot less expensive than that stupid Hazet wrench people are selling on EBay for $35.
I'll bet a lot of cars now use something in the range of 14mm somewhere - I'd try an automotive store.
If you just can't find one at all, I'll buy one for you and mail it for the costs. If you did want to do that, I'd advise you to come up with a shopping list of sizes to reduce the impact of the shipping cost.