hi astrogirl,
3 in 1 is not a poster but it actually photographs. instead of 1 big one also know as portrait, those 3 in 1 is like 3 pics but framed together side by side, so it look like a longish rectangular thingy. i dunno the cost but if u take a wedding package normally u can choose either the portrait or the 3 in 1.
hmm just curious, i have a colleague whom the students nicknamed astroboy (due to his hairstyle), are u by any chance related to him? hehe cos he is getting married next june!
eve