Bonanza bills itself as the "World's Largest Gift Shop" and while I am a fan of "World's Largest" attractions, Bonanza is not really worth a stop. It is a giant collection of tchotchkes. If you collect something, like silver spoons or thimbles, then this is your souvenir shop. You'll probably find a few good gift items here, especially if you want gag gifts. According to their website, Polly the Insulting Parrot is one of their best sellers.
Bonanza is bizarrely obsessed with security, including signs warning against stealing, video cameras, a security guard, stapling your bag of purchases closed, and checking your receipt when you leave.