Looks like VAT in Hungary is as high as 27% (is this the rate that applies in this case? VAT-inclusive pricing disguises this tax.), which accounts for much of the price difference.

Yes, 27% VAT + high tariffs are a toxic combination. At the same time for non Apple products there is maybe some dodging of taxes going on (like a company registered in Slovakia), you never know why a product is relatively cheap there, but you can guess.

I always used argep.hu for pricing computer bits. Dunno who's better