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Sunlu has a "Buy 2, Get 1 Free" offer for their water washable 3D printer resin. If you add 3 bottles of their water washable resin to your cart, you’ll get one bottle for free. So the total price is $ 31.98 for 3 bottles, which comes out to $ 10.66 per 1000g bottle.
The MOQ of 6 in the title there can be ignored.
Be sure to select the USA warehouse option first, then pick the WaterWash Standard Resin 1000G and add the colors you want to your cart.

Water washable resin doesn’t require IPA for post-processing. You can simply rinse off the excess resin with water. It’s compatible with all the common 405nm resin 3D printers. I use it a lot with my Creality Halot Plus, it prints fine.