The cuckoo is a pretty common one. It might date to the 1980's or even newer. In working condition it might bring $100.00.
The stagecoach clock dates to around the WWII era. It's not rare either, but many have been trashed and they are becoming less often seen. They're cute, but probably not worth too much more than the cuckoo.
The bottom one is a time only mantel. It would be good to know who made it (name on back of movement?). It looks to be in pretty good shape, and is probably going to be more valuable than the other two just because of it's age....but it won't make him rich . Could we see the back of the movement?
Collecting clocks is not about value but attraction. People like different things, and collect accordingly. All but the rarest of clocks are depreciating in value these days, so it's a buyers paradise and not so much so for sellers.
Yes, it's part of the hobby. That's not an unreasonable price for the repair. The French clocks have much smaller pivots than American clocks, and they are hardened, which means it's easier to break one off during assembly. On the other hand, it's a time only movement, which means there are fewer parts to worry about. You guys could probably do this repair yourselves after a little practice. Get yourselves an Ogee (sometimes spelled OG) movement to play with first. They are easily found, easy to work on, and will teach you a lot about repairing movements. Also, you can take any questions to the clock repair forum for assistance as you learn. Save that cuckoo for last. They are a PITA to work on
Regarding the value of your French clock - I doubt you could recover the price of the repair if you had it done professionally.
I believe the second clock (coach and horses) is not a stage coach. I think it is a (much simplified) representation of the coach used in the coronation of Queen Elizabeth the Second in London in 1953. The real coach had eight horses, but that might have been rather awkward to produce in this clock form. The whole model has been greatly simplified, the real coach is a lot more elaborate, but the crown on the top is there.
These coach models were very widely reproduced at the time, as tin plate toys, as costly porcelain models, cheap plastic ones etc. etc. As far as I can see, your clock is electric, so this would likely have been produced in USA as British electrics run on 240v which would not suit US supplies. Sadly, I would not expect it to be worth much, Kevin's estimate is likely about right, but though you might like to know a little of what I believe to be the reason for the design.