Basically I want to get a footswitch for my amp, Ashton GA100 (I didn't choose it, it was a present) and because it seems to be quite a low end amp, I can't find anywhere to get information on it.

I've found one website that has the "official" footswitch in stock (http://www.mveducation.com/invt/52582/) but I really don't want to be paying that much. Is there any cheaper alternative A/B footswitches I could buy instead (now would be a good time to mention the input on the amp is a single 1/4" jack input), or could I possibly build one myself?

Any help greatly appreciated.
I guess gear goes here ...
Epiphone SG Special
Ashton GA100
George Dennis Volume/Tremelo Pedal
Dunlop Cry Baby Wah
Digitech Bad Monkey

Vintage EST96NA Bass
Ashland Electro Acoustic