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Citric acid (synthetic and in fine granular form, but not necessarily food grade) is both, well suited and cheap.
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I've thought about using this also, I don't know how well it would work. But it's not cheep for me, I get it at the grocery store in the spice isle (called,
Sour Salt, it's 100% citrus acid) and runs about $2, but it's only 1/2 ounce.
I use Earth juice Dry pH adjusting crystals, I got both my pH up and down (1 pound ea) for under $20. That's 32 times as much (32x 1/2 ounce=1 pound) for less than $10. It has lasted me almost a year, I still have some of each (up/down) left. I cant see anything else being much cheaper. The trick is learning how much to use, but you have that problem with any pH product (made for hydro or not).