If you're budget-restricted, your best bet is this Lodis Clutch. It's a popular piece, while not very expensive. Another nice option is this Pierre Hardy Clutch. It's a product you're bound to love which also doesn't cost the earth. You might also want to consider this Fossil Clutch. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you can afford to spend a little more, look no further than this Anya Hindmarch Clutch. This item doesn't cost too much, but absolutely indispensable in your wardrobe. It's also worth checking out this BiniChic Barcelona Clutch. This item is extremely popular and, just as importantly, not very expensive.