Don't know if i'd really able to say what my best deal ever was...
To me, anything that saves me money that I would've *normally* spent is a great deal to me.
Sure, I've seen some really good deals for vacations to carribean, mexico, etc.. but to me it's not really a deal, cause I'd have to spend a bunch to go there, lol.
But when we were planning our Disney trip couple yrs ago, we got a decent deal there.. we were gonna go whether we got a deal or not (wanted to take dd's for their first trip).. and was able to get a 40% code, which helped a TON.
Then other smaller deals which I've loved are... few yrs ago, Kodak was running a promotion where you'd log in each day, type in a code, and win something.... I definitely took advantage of that, and over the period of a few weeks, won tons of mousepads, mugs, coasters, collages, and tons of 4x6 and 8x10 prints. I've used those items around our house, for dd's scrapbooks, for christmas gifts that year, etc.
And just last week, took advantage of the 75% Behr sale... we're always painting/remodeling rooms, so that saved us a ton there... bought enough for a few projects at least.
But I think i'd have to say my favorite deal I got was our camper 2 yrs ago. Was in "like new" condition... current year model, but the people who bought it returned it after just 2 outings (guess they wanted bigger model)... still in perfect shape.. but we got it for almost 1/2 the going rate of a new one.
Not sure if it's really saved us money for vacations... we have always loved going on long weekend type trips ever since we got married.. would do a few per year.. but now that we've bought the camper, we've kinda upped that number up to about 8-10 per year, lol...
But not really spending any more for the trips... was always approx. $100/night give or take for hotels, and now can do approx. $30-40/night for campgrounds.... and I get my own bed/pillow every time! And to me, it's so much more relaxing.. love it!