re: the comment above about gyochuko being "the" brand. It's "a" brand. Z is just as good as gyochuko with the fine saws, and better with crosscut saws and ryobas.
But both aren't very expensive in japan - they get marked up at distribution and retail in the west.
The older saws that are full hardened plate can be expensive (some are also still distributed to us in the west at great markup), but if you're willing to play around, you can usually find used semi-handmade (as in, made in a factory with some hand straightening, etc) hardened plate saws for a few dollars each, and then you can treat yourself to doing whatever you want with the teeth.
These 12 saws above were $19 total. I'm sure it cost about $30 more to get them all shipped here, but I wanted to have some saws that I could sharpen and modify. They're all sharpened crosscut with teeth that would otherwise look like rip teeth (as in, they have fleam and will be aggressive - this kind of saw is useful to me more than another slower cutting saw with tall teeth that leaves a very fine edge that will be hidden).
The tooth profile on them with fleam means they can all be turned into crosscut saw pretty easily.
One thing I found talking to stan covington (and he sent me a saw to prove it) is that if you want a saw for hardwoods from japan, it will end up looking and feeling in tooth profile and plate thickness more like a western saw. The hardness will be knocked back a bit to make sure that the saw is tough, and then you can horse around with it just like a western saw. The one that I had was tempered brown (stan had two custom made), with teeth slightly more aggressive than you'd find on a disston saw but shorter stouter profile like that - it couldn't have been broken by anyone who didn't run over it with a car.
That saw was custom made and monstrously expensive (it was entirely hand made, too), so it moved on to the west coast to someone who was looking to pay what it cost to have a saw like that made, but I learned a lot from that. Having later bought saws made in japan for professionals and some heavier saws for coarser work, it's clear that 1) stan knows what he's talking about when it comes to what's actually on the ground there, 2) there are some delicate saws of older types that are less forgiving than the Z and gyochuko types, but most of what you'll find in the auctions is more like the saws shown above - saws that would be more sensible as a permanent tool without exotic teeth. These are by flex just a bit harder than a western saw, but would still be resharpenable with a simple feather file, and they won't lose teeth to wood that has exceptionally hard latewood rings.