This is the cheapest Dark Souls 3 for PC. Cheaper than buying from CDkeys.com
Gamebillet Alternate store, selling for $19.99
If you want the Xbox version, it is $30 from Trent's post
If you have not played the series yet, this month's Humble Month Bundle subscription will get you the second game in the trilogy (Scholar of the First Sin) for 12 US dollars.
Enjoy.
do you reckon its worth playing them in order 1-2-3 if you have never played it. (Esp taking into account limited gaming time. i.e. may only end up playing 3 in a few years if i start with 1)