If you're looking for an affordable item, your best bet is this Calvin Klein Belt. It's a great item, while not very costly. Another strong contender for your wardrobe is this Judith Leiber Waist Belt. While the price of this item is not very high, it will surely attract a lot of attention. You might also want to consider this Asos Belt. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're looking for an item in the middle of the price range, look no further than this Moschino Waist Belt. This item doesn't cost the earth, but absolutely deserves a spot in your wardrobe. Why not also look at this Isabel Marant Belt. It's an attractive option both price and quality-wise. And do check out this Marni Belt! It's a very popular item and good value for money.