Folio Society is one but I find their price/quality ratio is dropping fast. Much of their older editions are cloth and buckram bound while their current work is mostly paper bound. The page paper quality itself also seems to be going down while the prices are rocketing up.

There's a lot of affordable pre 00's Folio Society to be found in an excellent state on the second hand market.

For the classics, Franklin Library has lovely leather bound (whole or quarterbound) books. The publisher is long since defunct but the books can be found affordably on the second hand market. Often completely unread as people used to just collect them.

If you're looking for cheap but decent looking hardcovers. Canterbury classics and Penguin both have a line of cloth bound classics that are still a cut above the average paper hardcover.

Suntup does beautiful editions at significant prices. They often have very limited runs though. People tend to sign up for waiting lists and books can sell out the moment they're made available.

Chiltern is another noted publisher of beautiful classics.

At the end of the day, this is a sliding scale. Limited editions is easy. Lots of publishers publish books in small runs. But fine editions...

For some it just means a nice hardcover that is stitched instead of glued. There's a lot of publishers these days that do cloth or (faux) leather bound and stitched books at very modest prices like Penguin, Gollancz, Barnes & Noble, and so on.

Then there's publishers that don't just pay attention to a nice cover but also put a great emphasis on page quality, fonts, sometimes even illustrations like Folio Society or Suntup. But even here, attention to detail is important. The books that Folio Society has printed in Europe are usually much more highly regarded than their China made books for instance.

There's even a few publishers like Arion press that don't print their books with modern print methods but still cast their own lead lettertype to run the pages on a printing press.

And the wealthiest collectors not uncommonly have books handmade at a cost of thousands of dollars per book. There are some very talented bookbinders around that'll do the job for a few hundred bucks a book but the mystery factor is always where they secure their pages and at what quality.

My collection is a mix of Franlin Library for the leatherbound and older cloth bound Folio Society with some Penguin classics mixed in.