Well, as for Robert E. Howard, you could go for the Chaosium collection, Nameless Cults. The price is about fifteen bucks and Robert M. Price always does a solid job as editor of these Call of Cthulhu Fiction Collections. I happen to have a copy I can sell you, if you want to send me your info - I am registered with PayPal.
Gavin Smith, Bookseller
3408 Pleasant Run Road
Irving, Texas 75062-3255
gavinicuss@hotmail.com (for PayPal payments)