If you are on a limited budget, this Frye Crossbody will fit the bill. It's a popular choice, while not very pricey. You can also look at this Baggu Crossbody. It's an item you'll fall in love with which also doesn't cost a fortune.
If you're looking for an item in the middle of the price range, why not check out this Anat Marin Crossbody. While the price is very reasonable, this item is an easy wardrobe update.