I would second ammoseek. I used to go to ammo.com or sgammo.com, but in the current climate both of these are out of stock on almost everything. I used it for the first time last week looking for .223 in 38 - 40 grain (kind of rare compared to the usual 55 grain and up) and found some. Prices, though, are not great.

I have a fairly old revolver in 32.20. I'm having trouble finding ammunition in less then case lots. Any ideas?

Buy a case.

Handloading. Make sure you get the proper propellant (the original is a black powder cartridge) for your gun.
Depending on the required amount and power, you could try to contact CAS shooters to get some ammo. It seems to be a fairly popular cartridge there. Be aware that CAS shooters do not tend to load ammo to high velocities.

Why are there shortages? Are you expecting factories to be closed in a new lockdown?
Qjs

The reason for the shortages may be that someone bought more than their share. Some may indeed expect factories to be closed.

In Finland we have no shortages. Life goes on as normal except that we have covid-pandemia and that does not affect the amount of goods in stores and shops.
Earlier in the spring people hoarded TP but that was all and ended by summer.

In an election year people tend to stock up. This year there are, according to news reports, many new gun buyers adding to ammo sales. When President PHRASECENSOREDPOSTERSHOULDKNOWBETTER. won in his first term gun sales increased, on the assumption that he would promote anti-gun policies. For the most part this didn't happen, but gun owners are a nervous lot.

Edited to add - I post this as a straight forward answer to the question, without political comment.

There's always some irrational/panic buying around important nation and international events, and the increased paranoia and tribalism of our present world have only made it worse. Then there's the semi-legitimate panic around the current pandemic. I say semi-legit because there are genuine supply chain issues caused by the disease sweeping through meat packing plants and other industries. My personal viewpoint is that it's always prudent to keep a few weeks worth of food, a couple months worth of medication, some water, etc. The wife of my employer had a very difficult time getting a prescribed medication for a dangerous congenital disorder so she was scrambling to try to stock a bit. I'd say, current events notwithstanding, if you have medications you need to stay healthy (or to stay alive, period) now is the time to talk to your doctor about the possibility of getting an extra month or two supply.

I haven't been able to find copies of Hamlet, you know, the good edition with annotations. Is it because it's an election year?