Try the street markets
There aren't too many shops in Gavedona other than a few smaller one and two larger food stores. For fun shopping though, try the street market 1st and 3rd Wednesday of every month. Just down the road in Dongo, the street market is 1st and 3rd Thursday of each month - but only in the morning. Otherwise try the huge street market in Como every Saturady all day.
What to buy: Anything that is made in Italy! Silk in Como though as this is the silk making city
What to pay: As little as possible. Don't be afraid to haggle a little. You will soon know when to stop.