cheap 125cc or even 50cc geared bike

Basically im after a cheap 125cc or even 50cc geared bike. Because I would like to do my A2 restricted but iv never done gears before and because im to lazy and to tight I thought id teach myself with a little help rather then spend lots of money on lessons

Im not fussed what it looks like pink brown blue rusty I don’t mind as long as it is road legal (tax and mot) and runs

Thanks Dan