GSM phone repeater

I am trying to build a GSM phone repeater that will work under 850MHz or 1900MHz frequency band which are main band in canada.

I am looking for a very small and a basic repeater (not those big and huge and complicated ones) that will give me some gain even if a gain of less than 1Watt. Could you please tell me where can I find a place to get the inner circuit of the repeater and basically on what type of board (evaluation board) we can have the whole circuit. I do not need any theory or how to do it I simply need to have the physical thing.

thanks a lot

Regards