I was researching the possibility of using boric acid instead of borax or tetraborate pentahydrate (what I've been using up until now). I really like the idea that I don't have to add acid with boric acid, but not if it means paying alot more.

I read in another forum (post was from 2010) that using borax + acid costs about 1.50 per pound total (much cheaper than the current prices for Bioguard Optimizer Plus that I've been using). Another post in the same forum provided this link to a source for boric acid:

http://www.aaa-chemicals.com/boac50poinba.html

At $60 for a 50# bag it's a great deal, but shipping is about $44 to where I live and makes it more expensive; 58 cents a pound more assuming the $1.50/pound figure for borax + acid is accurate.

It would be great if I could find this locally and save the shipping cost. Any ideas where I might find boric acid in quantity locally? If I cannot find it locally, I'll have to think about if the cost difference is worth the convenience to me.