Lots of good R lenses on eBay.
I bought the 60/2.8 macro there ($500), which lead me to a 28/2.8 version 1 with hood ($350) (which I sold, but kind of wish I hadn't, warts and all).
Next on eBay I bought the 28-70/3.5-4.5 second version ($600), which is awesome, once I ground the rear flare shield to clear the Canon FF bodies.
Next on eBay, is a pristine 135/2.8 for $300, followed by an excellent 100/4 macro (non-bellows type) for $285.
So far, the 60 macro is still my favorite, but all have special character and imaging.
What are you waiting for? The lens will be shipped to your house or business.