You can get MA at any hardware store, generally. Big box store may sell it too (i.e. HD, lowes). some pool stores carry it, but one pool store near me wont carry it. says it raises their insurance (not so sure there, they may just want to sell their own dry acid product).
Yea, TA is too high. pH close to being high. Bring the pH down to 7.2 and aerate. A fountain would work. You could turn one of the return jets up toward the surface. That can cut down on the surface circulation some, but it shouldnt be a problem. You just want to put some air in the water to outgas some of the CO2. That will make the pH rise. You get the pH back up, then lower again with MA. slow process, but the chemistry behind it is sound.