Any razor with good geometry, steel, and temper can be made to shave. I have several vintage razors from $5 to $40 all shave well, after honing. Before honing most were no better than the average knife. A new shave ready razor will run from the Dovo best quality $$ to very high end custom razors $$$$. Vintage shave ready razors run from whipped dog razors and SRP's Classifieds $$ to restored and honed vintage razors $$$ available on several vendor sites. Mint collectable razors can really take a huge chunk out of your wallet.
The biggest trouble is finding a budget razor that has been honed by a pro. Most any of the razors sold by one of the srp vendors or members will be truly shave ready. If you get a razor from somewhere else ask lots of questions. The best question is does the person who honed this razor shave with a straight he/she honed daily? Check the wiki for other good questions.
Jonathan