Usually a gun shop will have two or three on the racks.

I bought a few years ago a SMLE No.1 MkIII, maybe just as a wall hanger (can't actually hang it on the wall now) and didn't even check, but later found all the serial numbers on the parts all were original. Lucky find.

I'm still on the look out for a cut down SMLE in .303 and another in .25/.303. But I'm cheap and don't want to pay much. Twenty five years ago they were quite common.