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Furbys are common on eBay, shopgoodwill, and Facebook marketplace, but make sure you're not paying too much for them. Most colors (adult generations 1-5 and baby 1-2) aren't worth more than 40 dollars and you can get a lot of them for well under that if you're patient. Even most special editions can be found for around that price.
Personally I used to buy them in lots but after they became popular on tumblr that became less viable.