I dunno where you live, but I got a bucket hat at Nordstrom RACK, only it had a rainbow strip around it, but I took that off and it looked great. It was for my Urahara costume, so I just put on the stripes and it was all set to go. It was pretty cheap, too, if I recall correctly.
Of course that was more than a year ago, but you might be able to find one on ebay (but be careful on how long it takes to ship, because KumoriCon's coming up really soon, as you probably know).