QFT. If you care enough to get your posters properly framed, you probably should take them somewhere that specializes in framing and not some box store that gets high school students to do the framing when they aren't busy stocking shelves. Even with their 40-50% off sales, Michael's will cost close to what you pay a framing shop without the quality assurance. If you want a stock, cheap frame in the standard sizes, then Michael's is fine. If you want some quality work done, a place like Bank St Framing is the way to go. More expensive but you get what you pay for and they guarantee their work.