If you are on a budget, your best bet is this Belt. It's a popular piece, while not very expensive. Another strong contender for your wardrobe is this Rebecca Minkoff Belt. While the price of this piece is not very high, it will certainly attract a lot of attention. You might also want to consider this Kate Spade Belt. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
For something in the middle of the price range, look no further than this Raina Belt. This item doesn't cost too much, but definitely deserves a place in your wardrobe. You can also look at this B-Low the Belt Belt. It's an attractive option both price and quality-wise. Take a look at this Moschino Belt too! Great value for your money.