In a vintage razor, inexpensive and cheap do not equate, IMO.
For example, I have two $40 or so razors in full hollow I bought from Pinklather, and they are both EXCELLENT shavers.
I use Pinklather's razors as an example of some inexpensive razors that work, and work well (!!!) for a "you can't beat this" price.
That, IMO, is typical of what you'll find on the classifieds, and you can spend a little, or a lot, depending on the depth of you wallet, and personal taste.
I bought a Wade and Butcher near wedge from HNSB for $40 that is excellent as well.
Virtually anything done by Sham that fits your price range will blow your mind. I have two 1/4 hollows I just received a week or two ago for an average price of $55 (a total cost of $110). I know Sham has a lot of nice hones, but I swear they guy has magical fingers and hands as his edges are the best I've ever used.
The list goes on and on.
Just because you don't dump a lot of cash on a vintage razors doesn't mean it's "cheap"! My experience has been just the opposite. I won't go back to new manufacture razors unless they are custom made. (Well, I did buy out John Crowley's entire inventory of new 1/4 hollow Wackers about 2 weeks ago--I'd probably make an exception on buying new if they are Wacker razors which I consider to be "semi-custom" because he's a one man shop).
Kent