I'm much more likely these days to go to either ebay (e.g. for the replacement phone battery I got a week or two back) or to a vendor that doesn't do Amazon's commingling of stock (B&H, Target, etc.). This is particularly true where I think it's something likely to be counterfeited (any high-value commodity, thank god I'm not ordering something like baby formula).

I'm willing to pay a premium for the trust factor, because if I get burned with a bad product on even 10% of my purchases the value of my time dealing with it is probably more than I've ever saved ordering through Amazon - particularly if it's something I wanted quickly where I can't afford the chance of "Oh, sorry you got a counterfeit, we'll ship another and you'll have it in 2 days, hope it's legit this time."

Edit: And I don't think I'll EVER purchase a MicroSD card through Amazon.