I have purchased games from the Rockin' B Games online store and have convinced the owner to add additional Avalanche Press titles to his inventory.
Rockin B Games offers free shopping starting at $47.49 and a discount on checkout (2.5% to 20%) depending on the total. There is an additional permanent 2.5% and 5% discount once your lifetime purchases reach $250 and $750. You will have to check the exact percentages and threshold on their homepage (it's blocked at work).
https://shop.rockinbgames.com/#!/~/searc...=relevance
For example, Fire in the Steppe is listed at $85.49 on their site but if you were to buy just that, you will get an 11% discount for total purchases over $80 and free shipping. Total cost is $76.09. It's definitely an option to consider if you're not a Gold Club member or if you want to acquire just one title.