Most telescope would come with the adapter I would have thought???
If not you can get 2" Adapters:
http://www.bintel.com.au/Astrophotog...oductview.aspx
or
a 2" to 1.25: Reducer/Adapter
http://www.bintel.com.au/Accessories...oductview.aspx
The reducer would allow you to use smaller eye pieces as well.