In the Elephant shopping centre, lower floor eastern side if I recall right, is a cheap household goods shop. The quality won't be phenomenal but if you need a bunch of stuff on a tight budget it could be worth a look.
Tell them how many items and ask for a discount: you may get something off.
For bedding items, towels etc, I can recommend an online store that supplies hotel quality items (ie: not only good, but also durable), including those made from Egyptian cotton at very reasonable prices.
Check them out here and compare prices for equivalent items.
For quality pots and pans maybe the best place is across the river at John Lewis.