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Elegoo via eBay has buy 3 get 2 free. There is also a 20% eBay coupon: FINDYOURS20

1, Add 5 filaments of your choice to cart from this link [ebay.com] [ebay.com]
2, 2 of the filament rolls will be automatically discounted at checkout
3, Apply 20% coupon FINDYOURS20 at checkout

You can mix and match filaments, so pricing will vary depending on which filament you choose.

Below is some example pricing if choosing only the specific filament noted below.