I've just renovated/built a house and almost ready to start furnishing it.
Not quite there yet but had some real bargins so far, might not be far of furnishing the whole house with 2nd hand gear.
As well as the usual listed above for finding 2nd hand stuff, notice boards in supermarkets, paper shops or if any local independent house movers, often they will just have to empty houses for clearance
Just watch with auctions, make sure u are 100% clear on any fees/vat etc and pick up times, many auctions its not unusual to have a 15% buyers fee + ur vat so ur paying 35% more than the hammer price, suddenly the cheap thing u bought is 1/3 more expensive.
Not a problem as long as u realise it and factor in the extra 1/3 before u bid.
Ex demo kitchen from wickes 1k for a heap of cabinets, fair enough its a bit of a bodge to get them fitting and not exactly wot i would of picked but not that bad and excellent for the money
A cracking oak table, some chairs ( which are rubbish to be fair) and oak bed and mattress 90 quid for the lot
a 3 seat, 2 seat and 2 seat sofa combo 80 quid all great condition.
It is scary wot folk throw away nowadays and mental more folk refuse to have 2nd hand stuff