It is wonderful! You can get the shopping bug out of you, you can barter for pretty much anything, and *most* items are cheaply or reasonably priced! What more could a thrifty girl ask for?!
Some may be worried about going the garage sale route. There is no guarantee that you will stumble upon something "perfect" for your centerpieces/cake table/favors/etc. and the quantity of something you find may not be ideal. But for some things, it can really pay off!
While I was garage saling Saturday morning, I found tons of things that could potentially be used for a wedding!
Cake knife and server
Wishing well for cards
(it looked awful but one could fix it up if you really want a wishing well...not my style but to each his own)
Large shallow glass bowls
Loose dried lavender
And much more that I presently can't remember, lol
Really, look in the newspaper or on craigslist and start searching! Waking up early for a few Saturday mornings definitely can't hurt :)