Tyres are worth around £130 for the 2 rears and £110 for the 2 fronts. I've been watching a few on eBay of late in readiness for my change from runflats.
No idea on wheels but if they need a refurb I guess that's about £60 a corner.
Lepsons want £100 a wheel + vat but thats a top job and involves splitting the wheels with polished ( not painted) rims. I know they can be done cheaper but not sure if as good .
I would think £450 to £500 as they are including tyres