As a personal example, I've already moved a lot of my purchasing from Amazon to AliExpress. For anything small, fairly cheap, and that I don't need this week, I search AliExpress first. Quality can be uneven and you sometimes have to read between the lines on the reviews, but you can often find items identical to those on Amazon at 1/5-1/10 the price (eg. I just bought 3 sleeved baby bibs on AliExpress for $1.80/ea -- the going price on Amazon seems to be $16).