I agree with the trouble finding many parts (coils, index wheel, date disk...) for these movements and the scarcity of watchmakers who work on them. However, I think this issue is reflected on the price to a certain extent. You can find these in good condition for less than $500. If they break one day, they are still worth at least $200 for parts. It's possible to make even more by selling certain parts separately.
Below are the two that I have that are in working condition (too bad they are not synced for the photo). I purchased the black one from another OF member during the last year and serviced it. I bought the gold plated one on eBay as non-working, serviced it and had the case replated. It wasn’t the best economic decision, but I don’t mind spending an extra couple hundred dollars to save a nice looking, not working Omega that could get trashed otherwise, as long as I know that I will wear it occasionally. I have two more ongoing f300 projects that I will update this thread with once they are finished.