I just went to buy a parasol from the marketplace and found that all of the parasols (green, orange, yellow and violet) are selling lower in the marketplace than the prices on habbox:
Green Parasol: Value on Habbox - 34c (6/7c decrease)
Orange Parasol: Value on Habbox - 11c (1c decrease)
Violet Parasol: Value on Habbox - 12c (2/3c decrease)
Yellow Parasol: Value on Habbox - 12c (2/4c decrease)
Hope this helps