My Chuck Tyrell Westerns are mostly published by Robert Hale as Black Horse Westerns, and then in large type editions by Thorpe or Thorndike. Book Depository ( http://bookdepository.co.uk ) now has my newest, A Man Called Breed, on pre-order at a reasonable price. The best thing about Book Depository is it ships anywhere in the world free of charge.
Book Depository is also having a 25% off sale on The Killing Trail, a preorder offer on the large print version, for slightly over $10, shipping free. Good chance to get some good Western reading.