Prices for Electronics at BRU airport

Virtually no electronics at the airport are going to be cheaper than you could buy in any normal shop in the high street, or online.

And, it's only "tax-free" if you're travelling outside the EU.

The shops at the airport target wealthy business travelers, so high end premium products with high margins, or the "need to buy", i.e. someone who's forgotten to bring their electrical adaptor, and the shop can charge pretty much whatever they want.

The idea that you can buy tax free, good value electronic goods in a European airport passed away at least 40 years ago.

Not true. Dublin Airport is a lot cheaper to buy electric goods than the high street. Dixons Travel the shop is called.

The op asked about Brussels not Dublin airport.

Besides some actions where they are trying to dump larger quantities of specific items, it is more expensive. Even with TAX free (as mentioned only tax-free out of EU).

Have you ever tried googling prices on a tablet or smartphone?