Not sold at retail, but you can browse Prusa
Some links here are affiliate links. If you buy through one, Creator Gear earns a commission, at no extra cost to you.
Creators cited with this
Tom StantonYouTube, 1.6M followers“I also chose to 3D print the new piston from pla on my prusa Mark III as it's faster and cheaper than printing the Piston out of resin”
Watch the video at 4:031 more report from Tom Stanton
“…the next step is to print the crankcase and crankshaft which I printed with pla on my prusa Mark III”
Watch the video at 2:13
Snazzy LabsYouTube, 1.3M followers“I used my Prusa i3 mar 3 2015 10 upload the files and have a local maker create them for you or you may consider visiting your local public library or university because many institutions like this now have 3d printers available for free use my printer did an excellent job and I think the finished prints look really nice”
Watch the video at 1:59
Creators who use this also use

Prusa MK4
also used by 1 of them

Prusa XL
also used by 1 of them
Sosumi
also used by 1 of them

TRMNL
also used by 1 of them

Ubiquiti AirWire
also used by 1 of them

USB-C to DC barrel plug trigger cable kit
also used by 1 of them