There are many gift shops in Vinci, and most are nice. If you want something related to da Vinci, then you're in luck.
What to buy: From keychains, to blankets, everything and anything has either Leonardo's face or one of his paintings on it. They also sell other souvenirs that are very nice. I bought some nice terracotta reliefs for my garden that were very nice. Set of 3 for 10 euros. Scenes of medieval farmers, very quaint.
What to pay: Pretty cheap, good prices.
We found two shops near the castle that are worth mentioning. These shops are related to Leonardos work. They also got a range of postcards and articles.
The wind was howling really hard the last day of our visit in Tuscany and the old lady opened the door very inviting..
What to buy: -postcards
-models of Leonardo's inventions
-other artrelated products.-T-shirts
What to pay: average