If you go through Omega, they have to be done at Bienne, and the price is higher than with an 861 or 1861. If you go with an independent, then you will pay whatever they feel it's worth for their time. Might be the same as an 861, or could be more.
With regards to parts, the parts listed above (with the exception of the mainspring) are case parts, and these are not a problem to get - they are all readily available from Omega, and I buy them frequently. To say, based on those parts he listed, that there are no issues getting parts for a Cal. 321 is very misleading. Although many movement parts are available through Omega to anyone with an account, a lot of critical parts are not as Omega chooses to withhold them. So if you need an escape wheel, pallet fork, balance complete, some chronograph springs, various plates or bridges, etc. then you are out of luck. You will have to rely on the open market and hope you can find these parts at a reasonable price, if at all.
Now not every watch needs a part that can't be obtained easily, in fact it's sort of rare that they are needed. However because you have had a 321 repaired, replaced a few case parts, and didn't need anything that was discontinued obviously does not mean every part for the watch is easy to get...
Cheers, Al
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