they have to be short enough that they'll still fall back down um into the grass
they cannot be too tall because they have to be able to fall back onto the grass.
Bring along an extra bag to hold your purchases; compare prices at home to make sure you find actual bargains; find out beforehand the names of local authorized dealers, especially if you want to buy high-priced electronic equipment and wish to reduce the risk of purchasing counterfeit merchandise; and give yourself plenty of time to shop so you can compare prices.