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Elegoo via eBay has a promo, buy 3 get 2 free.
There is also a 15% eBay coupon: SHOPNOW15 Add 5 filaments of your choice to cart from this link [ebay.com]
2 of the filament rolls will be automatically discounted at checkout
Apply 15% coupon SHOPNOW15 at checkout
You can mix and match filaments, so pricing will vary depending on which filament you choose.
