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I found a 20% off coupon, plus the discount for buying a 3-pack of 500 mg capsules of both NAC and glycine from DoubleWood Supplements, to be the best price for capsules from a reliable company. Swanson Vitamins has both, but the sale when I needed them was not a good price, in comparison. You might be able to find a 20% off coupon for DoubleWood from a coupon site to use.

For glycine as a powder, there are some brands that have it very inexpensive, but I'd say a reasonable compromise with quality (from reviews at ConsumerLab.com) is Now Foods, followed by Nutricost.

The form of NAC I previously got was Jarrow Formula's time-release pill form. If only taking NAC, that should be best absorbed. I haven't looked up a powder NAC form.

Start with 500/500 mg or 600/600 mg of each, to see how you handle them. Do consider taking them separate from other supplements, and NAC may bump up serotonin a little, which can be a concern for some people taking medicines, so do some research to make sure you will be fine.