My 11 speed 105 mechanical left (front mech) shifter broke at the end of last year. Some of the internals grenaded (probably due to a cable routing issue in the frame, I had to use extra force to shift the front mech).

The shop had no problems finding a replacement, but it wasn't as cheap as I expected. I think it was $120+/-.


Gummed up shifters - I bought an older bike with Ultegra 9 speed setup. It had sat for a spell and wouldn't shift. I shot WD40 inside and worked the shifters thru the gears a bunch, let it dry, then hit it with some Tri Flow. Had to do that exercise twice... but they've been good now for the past 2 years.