Hello Swiss Family,
It´s quite difficult to give you a price concerning your requirements. All depends on what you want. There are nice furniture shops but the prices are horrendously high. The local furniture are very good and beautiful but you need to beware of the wood. Most look beautiful but very bad wood. This would not last. You need a good carpenter to help identify the ones with good wood.
Concerning buying a car. This is very possible as Ghana is swamped with loads of cars to sell. Again you need someone who knows about cars to identify a good one.
Lastly Ghana is a country of bargains. The price that´ll be quoted to you as foreigners will be doubled or tripled. I detest ripoffs! You need to bargain or be ripped off.
Anyway, if you need help in any of the above i am willing to help with no strings attached. And, most important i am for free. I am also an expat, but i know the tips and tricks. You can contact me whenever.
Nance