Logitech RamblePad has two sticks on it (4-axis analog joystick). I bought mine off eBay refurbished for $10 + sh.
The only problem with it is that throttle stick is also centered (i.e., it returnes to the center instead of staying where you leave it).
Works fine with all sims, including FMS.

Another option is to find a broken TX and convert it into 4-axis analog joystick. There're plenty of places on the Net, where this conversion is described.

Hope this helps,
Boris