I made mine. I used wide red ribbon with white polka dots so it was Disney without being too busy. I have a snap tool since I do a lot of sewing including bib making. I just cut it to the desired length and added snaps to the end. You could sew the end too if you just wanted to put it on over your head. The ribbon I was able to use for other projects too. I get lots of compliments whenever we are at Disney.
We got ours at the Disney outlet in orlando for ,49cents! ALso, the walmart there has some that are fun and inexpensive!! The ones from Michaels are much shorter - so may work better for little kiddos!
This is random, but I just ordered some of these for guests at my wedding from this site called discountmugs.com. They had pretty good deals if you want to get them in bulk and you want them personalized like with your name or something like "Smith Family Disney Trip 2010."
I just bought my niece a Minnie one from party city for $1. They also had dark blue, a maroon color, black, and orange. I think that the plain colors were for graduation though because they had lots of balloons in the same colors.