Do you know anyone with one of them ZOS Side Wheel scopes from China.
A few @ PARC have them. I got one for my grandson.
For around £100 inc' post & insurance, they take some beating.
Then go to Optics Wharehouse:-
http://www.opticswarehouse.com/acatalog/info.html
And get a Deben Side Wheel about £16
Do a search on eday .
Ray