There seems to have been a swarm of requests for cheap/free items recently on the forum. Here's my advice...
Switzerland is one of the most expensive places to live on the planet which you should know before moving here, so cheap/free does not exist.
Use google/ricardo/e-bay/etc, etc.
Walk/cycle around the KleinBasel portion of Basel, there are a lot of cheaper shops and 2nd hand shops.
Also search on this forum in the for sale/wanted thread if it's not there no one is selling.
Shop in Lorrach, Germany just across the border it will be cheaper but some items you will have to pay tax on. (Check under a search in English Forum)
If you get really desperate cycle round Basel until you find items on the street labelled "gratis" this means free and you can take them away for nothing.
Otherwise
www.ikea.com