Have you tried searching for the posted Amazon freebies at other stores? Often Sony, Kobo or Smashwords will have them as well (and B&N too I imagine, but I never check there). I always keep 4 store tabs open (Kobo, Sony, AmazonCA and Smashwords) and check all freebies in each store (copy/paste is your friend
)
When I have time, I do post if I can find them at other sites, but I don't generally bother if it's too long after the original freebie post. I assumed that people would have checked their preferred stores long before they got to my post. Goes to show a person shouldn't assume.
Comes from reading the forums in linear format instead of threaded, I guess.