The shop is just open fridays and Saturdays. So try to visit Enköping one of these two days, then you can make a visit to this place.
What to buy: Here you buy books which are second hand and maybe quite old. Here you can make a lot of bargains.
What to pay: All kind of prices.
The distance is six kilometers and you can start anywhere you want. If you visit the tourist office they will give you a map and further information about this. You find more information on Enköping´s web page.
Equipment: You need just very comfortable shoes and clothes.