Well it depends. If it's a small spot, probably under $1k because you can just patch it. But if it's big or severely damaged you may have to cut a quarter panel out of a teg from the junkyard and have it welded in. Guys on other forums say this is about 1.5K per side plus cost of the quarter.
Oh and I just found out that you CAN buy new oem quarters from Acura supposedly. Idk on the cost though.