Paul, you just reminded me......
When I was living outside of Chicago (years ago....,) I found a hole in the wall butcher that was really good.  I'd wandered in to get beef for Stroganoff, and since I was the only customer, he offered to slice it up for me.  He'd just started, when somebody walked in with a newspaper wrapped bundle in one hand, and set it the bundle down next to the butcher.  The butcher immediately stopped what he was doing, opened the bundle, took out the twin to the knife he had been using, and finished the slicing job, with a visibly easier effort.  Turns out he had 2 complete sets of knives, and one was always out for sharpening.  He offered to send my kitchen knives out, but I'd have been without for 4-5 days.  
I really miss that butcher shop.