Ya get what you pay for sometimes and it certainly applies here.There's Daox of Ecomodder.com who 3D-prints a 1, 2 or 3-button shifter knob:
For sale: Custom 3D printed shift knobs with integrated buttons - Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com
With the Ecomodder logo
I bought one a couple years ago with my old Insight. The buttons would get stuck and the wiring to the buttons was janky at best.
For $30 I didn't expect much and if you're ok with modifying it to work properly then it's fine.
Perhaps his process has improved since I bought one 2-3 years ago.