Hi Gerald, I am not certain where to go to get the “best deal,” but you can try Giselle’s for electronics. Family owned and nice people willing to extend nice discounts. They are on the same street as Slyvia’s Farmacia San Francisco.
There is a furniture store on the southwest corner of 10 de Agosto (Leather Street) and the street that runs in front of the mercado. Go in there and see what they have. The houseware stores on that corner are places to by plates, plastics, etc.
We bought our blankets (wool and VERY nice) at a specialty store in Otavalo that is no longer there. You’ll find good-quality sheets at Todo Hogar in Ibarra (in the same complex as SuperMaxi) and you may find some other things you need at Kywi hardware store (smaller Home Depot) in that same complex. You may also want to price TVs and DVD player at Todo Hogar.