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Creality currently has an offer for 5 bottles of their SLA 3d printer resin for $ 55. So $ 11 per bottle or $ 22 per litre, compared to about $ 29 per litre if you buy the Creality resin on Amazon.
It works with all resin printers from other manufacturers like Elegoo, Anycubic etc. too of course, not just with the Creality ones.

There are three options available, each one contains 5x 0.5 litre bottles:
5x Gray
or 5x Transparentg
or 2x Gray + 1x Black + 1x Transparent + 1x Flesh (for miniatures/painting)