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i wouldnt think its worth it. it wouldnt be a noticeable difference to swap. now, if its a ls series motor and it would fit, then you should go for it .
Can it be done? Without a doubt. Can it be done "for a low cost"? I seriously doubt it. Unless you know someone that can get a helluva deal on the 7sp tranny.
Unless you plan on keeping your car for the better part of a decade the 1MPG or so increase from 5AT-7AT wouldn't be worth it unless you found someone who blew their tranny and could give you a decent amount for your 5AT.
n e ways just trade the car in. seems like more of a headache than its worth. not to mention no more warranty, resale will drop blah blah blah. I wouldn't buy an 08 with a swap for more, i would pay less.