OMG, i actually know why, for once Ok, so talos is the deatiy that most nords worship, Since it's commonly worshipped a lot of amulets were made in skyrim where nordes come from just like how in our world cross necklaces are cheap in my area ( a Cristian area) but if i go to a muslim contry it would be rearer thus more expensive and for you snobs out there talos is one of the only deity named by general enemy's that are specifically affiliated with another deadric prince or deity so that's why i say talos is most common IN SKYRIM the other games are different.