I disagree about the poundland shop. It's been great for stuff I don't need: so far I've bought a lot of Toblerone, a novel by Mark Gatiss from the League of Gentlemen, a pink cowboy hat, an HG Wells War of the Worlds audiobook, and a squeaky dog toy in the shape of a doughnut. Actually, that's quite a scary list
But everytime I've tried to buy something useful it was too shit to use. Some screwdrivers that wouldn't turn properly cos they weren't set in the handle properly. A tape measure that fell apart almost instantly. I never took them back because for the money it wouldn't have been worth my time in the queue frankly. That kind of illustrates the base-level self-reflexive shittiness of most of the produce there: product with no use-value that isn't even recyclable; landfill waiting to happen.
There is fortunately that arch that still sells DIY stuff and tools.