In the UK a service on a Yashicamat works out at 50 ($80), it's usually a little bit less in the US, however you shoud be able to get a good 124 or 124g for $200 that doesn't need the shutter servicing.

My service guy strips, cleans, then rebuilds the shutter so it's not a quick job but you do get a shutter that will be good for quite a number of years.

Ian