Hardware "R Shoulder" on Joycon needs replacement

[Rykin]

So, I got a used Switch from ebay that came with an old set of joycons. The problem with the right joycon is that the "R" shoulder button (not the trigger), doesn't work 2/3rds of the time, so I'd like to replace it. It's the part that is soldered on the board and NOT part of the ribbon cable. I'm fine with soldering, but I was curious if anyone knows where I can find these buttons?

I've seen some on ebay that were stripped from other joycons, but they're $5 a piece. I'm used to being able to purchase a handful for that price.

Anyone happen to know where I can buy a handful of these tact buttons for cheap?