A cactoid cannon! Probably best to use this with some very thick gloves otherwise you might end up covered in spiky cactus spines!
Cactus Cannon price in Growtopia: sells for about 75 WL (median of 15 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.
Recently sold at: XQEW, RKZT