We're ready to get stuff for our bathroom renovation - which can't actually be renovated for a few months as we have salt damp and the wall has to dry out for 3-4 months first

So I know I can buy taps at Bunnings for $10 or at a bathroom showroom for $700... what's the difference? What's a good brand that's reliable and fairly priced?

Same goes for loos... I know I can get them for under $200 - or as much as $3000 I don't get it?

Advice/suggestions most welcome!