Agree entirely about a joystick, preferably with 'twist.'
But if money really is a problem, even a two-axis (non-twist) joystick will give you steering on the ground (and on the takeoff run) just by moving it directly left or right.
...I may be up a gum tree here, but...
Taxiing:
..if you just use the left/right application of the joystick, you merely operate the alerons, therefore tipping the wings onto the ground when taxiing, resulting in severe damage!
The wings MUST be kept parallel to the ground (ignoring the effect of side winds), and changing direction is performed by using a TWIST joystick to operate the rudder AND nose wheel, or by using Num Pad keys "0" and "Enter" if the stick doesn't have a twist action.
For a Tail-Dragger, the application of rudder and "differential braking" is used to change direction, together with quick bursts from the engine.
Paul....in a bit of a twist... 8-)...!
Tip: After landing, always bring the aircraft to a complete standstill before turning onto a taxiway, etc, to prevent tipping the wing(s) onto the ground.
Particularly important on small, light GA Aircraft!
..don't drive it like a motor car...

...!