Well i stayed in tamale for a year and i think it depends on the type of room u looking for. A single room can cost u like 50 to 70GHC per month, whiles a chamber and hall goes for 100 to 200 ghc, and for a flat u can budget around 250ghc to 500ghc..... But its advisable to go there and search for urself since the agents will charge u more than the required amount
I think u can book a chesp guest house for some few days that will cost u like 30ghc to 50ghc a day , then u go to the area u wud want to rent and search by urself.