Started making my own glycine capsules a couple months ago after reading one of the studies. 8oz of glycine powder and 1000 capsules was all of $21. A bit tedious filling the capsules but the savings is worth it. Based on my calculations filling the capsule 50% is the correct amount. 8oz of powder will last a year easily.
What about just dropping a small spoonful (correct amount size) of the power into some drinkable liquid and gulping that down? Pop it in the morning coffee??