Ive mostly bought .32's online, and never had any problems finding it, nor was it all that expensive, but that was before the panic. Then again these days, everything in demand can be tough to find, but it has been better of late. I bought a bunch when it was cheaper, so I havent had to buy now with the bloated prices. Did the same with .380's.
The .32's I saw at Walmart were Remingtons, and were around $25 a box. These days, our local Walmart seems well stocked for ammo in general, even .22's on a fairly regular basis, although they do ration them. Their 100 round 9mm value packs are still one of the better deals, and only $26/100. They were only $6 cheaper prior to the panic. Still, thats case price by the box, and no shipping.
One thing I have noticed all along, with any of them, is the premium ammo is all pretty much the same price for most calibers, and always has been. Online, the prices are usually better and usually for 50 round boxes, not the 20 rounders the shops are usually peddling for about the same money.
Personally, I cant remember ever really finding any "deals" on ammo at gun shows. The internet so far, has always been the best bet, especially when you buy in bulk, and that still seems to be the case.
I think for guns like the CZ50/70's, and a few of the other military surplus guns in calibers like .32, it boils down to if you shoot them enough for them to be economical. If you buy by the box, things seem a lot more expensive, than if you buy it by the case, and/or reload. Ive had a number of .32's over the years, and still do, and actually prefer it over .380, as I dont think the difference in performance is really all that much, and the .32's are usually easier to shoot well with, especially in the smaller guns. In the larger guns, like the CZ's, they are very pleasant to shoot, and mine have all been quite accurate.