Well so far from my last received order I've deduced:
Cheap too good to be true clothing: It might look fine on the pics but when you get it it's super thin polyester - might melt on the first wash kind of junk.
Fake plants: If you do your due diligence and check the reviews with pics there are some real gems out there with low pricing, I'm quite happy with my choices so far.
Household items: Also bordering on cheap junk, but check all the reviews, some are worthwhile and might actually be fit for purpose.
Mechanical items: If it's made from iron, steel, rubber and composites, these are surprising good for what you pay.
Electronics: No idea as I haven't ordered any, but in my opinion no-name items are a gamble whether you get something decent or something that burns your house down. There are almost no regulations on these products.
EDIT: And I also ordered a canvas shoulder bag, which was not as super cheap as the others but about R150 and after first use seems to be pretty decent, happy with the quality so far.