Temu is the current loss leader. You have to be careful as there are some items more expense than the Amazon or Aliexpress options, but many are 1/2-2/3 of the Amazon price with free shipping. Most items are 7-10 days shipping, but Amazon (to a rural address) is barely a couple days better with prime and about on par without.
Shipping has pretty much killed Aliexpress for me. I’m not willing to buy anything expensive as it’s effectively impossible to return and most sellers have an Amazon sellers account that is the same price or less once intl shipping is added.