A Rocker does not really sound like a Tiny Terror. If one likes the tone of a TT but wnats a bit more volume as well as channel switching capability. the Dual Terror may be the ticket.
In the UK those amps are dirt cheap. There are very few amps similar. A Rockerverb is A LOT more expensive. The closest would be a second hand Rocker 30, which would be around the same price as a brand new Dual Terror.