There are many small shops and stores in Tampere, most of the located at the center. If you find an interesting one, please add it here as a child page.
Clas Ohlson sells all kinds of useful stuff that might be needed in everyday life (electrical equipment, tools & hardware, multimedia appliances, DIY products, etc.) at affordable prices. The address is Hämeenkatu 11. More information on their website: http://www.clasohlson.co.uk/Product/StartPageProducts.aspx
Tampere has the biggest roofed market hall in Scandinavia. If you cannot find something related to food in the normal markets, this is your place to go. There is over 400m of service counters and it's open from Monday to Friday. I don't want to hear anyone complaining that Finland doesn't have good bread, or meat, or cheese, or whatever. If you say this, you just can't find it!