If you didn't know, the distance away from home and the order in which you place lands determins what level of items you can purchase there. The listing of purchasable items is above, incase you missed it. Generally, the higher the level, the stronger the items. However, you will always want 4 lands that sell all 4 levels of Materials. A towns total points is itsdistance from home added to the number land it is.
Horizonatal rows are the lands distance from home.
Vertical columns are the number land it is. The number represents the level number the shop will be. I'm not possitive about the bottom of the chart. E-mail me if you find it isn't correct. Home will always be the first land you place.