If you are after MUT coins then the best place to research for them as well as to buy the right ones would be online. There are many stores that specialize in the distribution and exchange of mut coins which will simplify the process of researching and identifying the right ones that you would like to purchase for your gaming experience. Whether you would like your MUT coins for a game on the Xbox Live system or on the PSN Network you will be able to find everything provided that you can get access to the right website for the same.
What you can do is research on discussion forums related to games that you are interested in so that you can get recommendations on the best websites to visit for MUT coins that you may be after from time to time. This is not a very difficult thing to do given that everyone happens to have internet access these days as most mobile phones are equipped with this facility. So be sure to make use of your device to gain access to the internet so that you can research where you could be getting the best mut coins from.
Mut coins may be available in different ways from different sources. You could buy it in exchange for money on some web sites as well as be able to exchange for other points or resources that you might have on another website. You should therefore research to identify a way of getting mut coins in your preferred way.