I’ve bought some cheap plates recently from Tesco but they seem to keep changing their prices, 5kg for £5 and the 10kg were £15 but seem to have gone up to £30.
6ft Barbell I bought from some dutch place on ebay for £18, dumbbells were £16 from argos.
I then bought a load of bargain plates from gumtree and the bay, got 95kg for £20 and 55kg and a load of bars for £20 as well.
All standard non olympic but I’d say the bay and the tree are the way forward.