It's unfortunate, but like Hurst says, someone is going to get caught at the transition of the uniform cycle no matter what.
'Course, the club COULD say the U18 teams can use the kits they already own for their last season, and everyone U17 and below buys the new kits and moves up with them, getting at least two seasons out of them. We did that last year since all but a couple of players already had uniforms for their last season. That would only really work, though, if everyone on the U18 teams is a true U18...anyone playing up in age group would have to buy the new kit next year, probably with the same one-season use. Transition is going to catch someone.
Now, $200 for a uniform kit is another matter...and we wonder why so many people in America regard soccer as an "elite" sport.