Hmm.. You Know Dream, I Would Ask A Host Or Someone Who is Good With Trading About That Q. It's Very Likely They Know What It's Worth.
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Sea green cactus is beta but it was given out offer during dreams month, it was considered low beta before dreams so value is even lower now. That said, it is still a good item and depending on what your looking for could probally get you a couple of pirate Q items or several lower demand but still rare items.