One of the pioneering writers of Westerns (in addition to Zane Grey, already mentioned) is
William MacLeod Raine.
MobileReference has a selection of his novels available, located here, for only $3.19 ---
http://www.amazon.com/Collected-West...3813062&sr=1-3
There is also this collection, which is also available from Amazon, for $1.99, located here:
http://www.amazon.com/William-Maveri...3812843&sr=1-1
The collection includes 21 novels.
Of the two collections, MobileReference is the better choice - and these omnibus volumes are always better presented than the competition - although it's a little higher in price.
Don