At the risk of dogpiling on other comments, I also feel Amazon's quality has hit rock bottom. I used to use Amazon because it had a reputation for quality items. Now they all come from China and I pay Western prices for the privilege of having it shipped to me faster.
USB keys and SD cards are almost all universally garbage rip-offs, and I recently purchased a stroller from Amazon, but had a bit of a panic moment when I wondered whether the baby carrier itself was certified by Canadian authorities (it was, but I shouldn't have to ever wonder).
For all of my child's items, I'm now steering clear of Amazon.