I have gotten used Betson Trackballs for as little as $0.99 plus $6.00 shipping from Ebay. I had to remove the rust off the rollers, then oil the bearings. Then I took a Microsoft PS/2 Mouse that I had lying around and hacked it to the trackball optical encoders. I then incorporated it into my existing control panel. For the buttons, I took a USB mouse and wired 3 of the CP buttons to the 3 switches on the mouse PCB.
So it is possible to make a trackball controller for very cheap, you just need a little time and patience and spare materials.
Unless you have the following stuff already, you will have to purchase some or all of the following items:
Trackball plate (optional, but makes life easier if you have it) $14 plus shipping
Trackball repair kit if the old shafts and bearings are shot (optional) $30 plus shipping
3 arcade buttons $1.50 each plus shipping
Wire for hooking up buttons ?
Plywood, MDF, or particle board for CP top and sides $7 to $20 (depending on the quality)
Optional T-Molding (about 6 feet) $0.95 per foot (cheaper if you buy it in bulk)
Paint or Vinyl CP overlay (optional) $10 to $25
Soldering iron, solder, tools, etc... $???
Labor...$???
So it is up to you to decide how much it is worth to you to build your own, or get the X-Arcade package.
A final word about building your own. I had a new Happ Controls Trackball already in my control panel, but I swapped it with the $0.99 Betson that I hacked because I liked the feel of it better, it was "broken in" and rolled smoothly. It did not spin as long as the new Happ, which feels almost "too smooth" to me anyway. I was lucky enough to get a Betson that did not require a $30 trackball repair kit.
If you want to play classics like Centipede, Crystal Castles, Missile Command, etc. a used Betson would be good, but if you want to play Golden Tee, then you really need a brand new or barely used Happ or Betson, which would cost about the same, or more than a new X-arcade unit anyway.
Of course, I have been building for a while, and a lot of the stuff I had already. Plus I have a nicely equipped wood shop and experience with electronics and soldering. So, to me at least, it was worth it to build my own.
I don't mean to be a party-pooper, just letting you know what's really involved. But if you enjoy the challenge like I do, then hack away...
