I agree with lovesbmw. You should buy bags that you are absolutely in love with and will use often. You might not be able to snag the exact same bag at sale price. If its a pretty bag, its probably sold out at regular price.
don't feel too bad about the sale bags... there's very limited items and they are most probably the ones that people liked the least because they remained unsold for months!
i was able to get a JM on sale but in my opinion, it wasn't in its pristine condition... it looks like it was used or something... my husband said it looked new but i'm still happy i got it at a discounted price because otherwise, i would'nt have gotten it at its full price. I would still rather invest in classic bags. So just love your bag! IT must be pretty since you bought it :-)
It happens all the time and has happened to me on seven ocassions over the pst 10 years, before TPF. I just let it go and realize that I have made a conscience, deliberate, well-thought out choice when making purchases and can not become overly concerned with those lucky enough the find the very few bags available during sales time that are quite limited.