Black Nylon Crossbody Bags from Forzieri
If you're after a thrifty option, this Bric's Crossbody Bag will fit the bill. It's a popular choice, while not very costly.
If you're looking for an item in the middle of the price range, why not opt for this Moreschi Crossbody Bag. While the price is very reasonable, this item is an easy wardrobe update.