[codebje]

A bare atmega328p-pu is 10x the price. LEDs are about 15x. Resistors and caps are, as another poster said, huge, but you're possibly getting factory seconds from an already mediocre brand. I buy decoupling ceramics and 5% resistors from China for peanuts but stick to RS online for caps where I depend on characteristics or reliability.

China sells a lot of older stock via AliX, so newer chips are hard to find and might be near the same price, but older clonable classics like a 2n7k are dirt cheap and just as good.