I'm also trying to keep the entire project under $30.
Hacking an old joystick for the PCB is a definite option. I've been watching Craigslist for a giveaway.
It seems silly that I can get what I need and a ton more for $5 that way, but to get a new board is upwards of $60.
I have home built pedals because I was very unhappy with my CH Pedals.
Matter of fact, the game port cable of my current set came from the CH Pedals I hacked back in 2001.
I'm not saying CH pedals are bad... They're just not right for me.
With my home built set, I can control the rudder with just my toes (sock foot) or my feet (shoe foot).
The CH pedals require moving my legs, bending at the knee. It gave me leg cramps, especially in the thighs.