This once is a bit complicated, but basically Anycubic has had a Buy 2 Get 1 Free promo going on for a while.  Two of these, (Grey and Black) are currently on lightning deal and the Transparent Green also has an additional 20% off at checkout.  If you add these to cart (can only have 1 of each at Lightning Deal Price) total should be $44.38.

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Links

Black

Gray

Transparent Green

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There are a number of variations on this, basically anything at the 3 for 2 promo page above.

• Add this 2x 1000g clear plant-based resin at Lightning Deal price instead of transparent green and total is $58.98/4000g
• Add an additional Gray or Black at regular price instead of lightning deal for $49.98 (still free, but don’t get additional 20% off at checkout)