There is no shortage of good used stators and pick-ups for the early bikes. I have a pile of them here and don't consider them part of my inventory. A new stator can be had for $150; there are no new pick-ups or coils. Any old rectifier/regulator can be persuaded to wire up; the adventurous may fabricate one from scratch. New ones are $125. Gen I rotors are another story: there are none to be had used or new at any price. Years ago, there was a fellow in the Mid-West who ground off the rivets (no small job), flipped the gear over and welded the toothed part back on. I believe he charged a buck and a half. If you have an adventurous machine shop in your area, you might see if they'll undertake this sort of job. But expect to pay several hundred dollars.
I just got my new Rick's catalog and pricelist. Sadly, it's a combination of Excel and pdf and one can't simply copy and paste pictures out of it. It requires a lot of flipping back-and-forth to price parts.
Good news? Gen I TCI units are available for $195. As are Gen I and Gen II starter motors.I suggest that you look at their web site then comtact me. I'll sell it at the listed price. Rick's has a multi-page dealer agreement that among other things has the dealer promise not to sell any of Rick's products for less than Rick's sells them. Look at eBay: the same parts always at the same price. Is it price fixing? Feels like it, but no one is stopping it.