As for coinage in Tuchuk, you will be hard pressed to find any except in that which you are given for your Clan work, but other than that, most of Tuchuk does not accept coin as Raziel stated, it is only good for weighing down your pouches. Instead, look to barter something of yours for services rendered, whether it be furs, something that is in your possessions or perhaps another service (training a sleen, helping out with repairs, or just being there to talk).
There are many different ways and items you can do to barter, just thinking or talk it out with the person you are bartering with and I am sure you will both come up with something that is fair and adequate for whatever it is you are seeking. Also if you are still in need of a new wagon, see Nicolas Tabar as he's the Clan Elder for the Carpenters/Builder's Clan and I am sure the two of you can work something out for such.