I was looking on this site and someone mentioned this place to get Nitric Acid http://www.jrjohnson.com/product.php?productid=16409&cat=347&page=2 for $22.00 for 165 lb barrel and i would guess thats about 20 gallons.Has anyone else tried this site .It seems legit and well put together.Just would like to know if this is to good to be true .Whats the catch?