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Glassware
You don’t have to spend a lot on glasses. If you’re a big martini drinker, than you could invest in martini glasses, or if you want a more all-purpose cocktail glass, you could get a few coup glasses. Otherwise, just get a few low-ball tumblers. You can always add more later as you need to. They sell glassware all over and there is no need to spend a ton of money. Consider looking at thrift stores and having a mixed set.