2005 Tundra ignition cylinder about to give up the ghost

I've ignored my sticky ignition cylinder long enough- I can barely get it to turn now. I know it's the cylinder because my mechanic told me so, a few months ago. Should I take my truck to the dealership, my mechanic, or a locksmith?

 

There's probably a YouTube video to do it yourself. These aren't chipped so nothing to program.

 

Yeah, that would be something I'd like to do if I had the time, but I need this done fast. Just want to know the best place to take it.

 

Call the mechanic that diagnosed it and have them order part. Make an appointment when part is there and drop off truck.