I buy .25 Stevens on Gunbroker. Look for the Canuck. Made in Canada up until the '70's You can buy it for around $1 a round if you are patient. Just bought a box of Remington probably from the '50's for under $50 shipped. Not cheap but avaialable. .32 Rimfire I bought from SOG several years back for $25 + shipping. Navy Arms has it available from time to time but has not been available for some time. It is also available on Gunbroker but I have not priced it lately because I have a supply. I bought 2 boxes at a gun show recently for $35 a box. Probably will run around $50. I have been saying for years that there is money to be made if somone like Navy Arms would have both these calibers made again. The .32 that Navy Arms had was made in South Americia. Good luck finding a deal.

If you're bored with just going down to the gun shop and buying cartridges that everyone else uses, and want to have some fun, get a copy of both the June '10 and October '10 SSE (call Brett Boyd, 803-628-5326). The June issue has my article about shooting .25 Stevens Rimfires using reworked .22 Hornet shells and the October issue has my article about shooting the little .32s, including .32 rimfires using reworked 32 S&W Long, 32 H&R Mag., .327 Fed. Mag, or .32 Long Colt cases. There are lots of nice 25 and 32 rimfires available, and with a little work, they shoot very well and are a lot of fun. If enough of us bug the nice folks at Buffalo Arms or the other custom cartridge manufacturers, they might even start making modified cases using .22 cases for primers for reloading. Dixie has some short cases for some applications, but with a little machine work you can make what you need to keep the old-timers shooting.

Dixie made adapter cases using .22 blanks for the .44 RF for sure, as I have some. But they're not a viable option from my experience. Try getting a fired .22 blank out of that .44 case once it's allowed to expand without a chamber to control it. It's a royal pain, and mine are bench decorations now.
I'd assume that there's not really enough meat in the .32 case to hold the .22 blank, but maybe I'm wrong. Even so, I'd never use them, as too much time spent frustrated, and I'd rather be shooting. 
I'd convert my little Ballard #3 in .25RF to something else more shootable, but it's such a minty gun I hate to do anything to it.

Yes, you DO use a .22 blank, but it's a special blank designed for this application. A whole tin of them comes with the adapters, and they have no charge other than the primer charge. The case is supposed to be filled with blackpowder.

I tried the .38 RF adaptors in my Remington #2 rolling block, using .22 Short cases with the bullets and powder charges removed.  I found the adaptors didn't hold up very well.  The adaptors are thin brass and there's not a lot of web there next to the hole for the .22 case to resist the firing pin blow.  The rim and side would break after 30 shots or so.

Also, be sure to wear good goggles if you shoot these adaptors in a rifle.  A pistol is better adapted to these inserts because it is held well out in front of you; with the rifle I would feel the "bugbite" of burning powder grains on my face once in a while.

On the other hand, the rifle shot pretty well...