If you are on a budget, this Innue' Satchel Bag will fit the bill. It's a popular choice, while not very pricey. Another savvy option is this Satchel Bag. It's an item you'll fall in love with which also doesn't cost the earth. You might also want to consider this Buti Satchel Bag. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're after a bargain, take a look at this Sergio Rossi Satchel Bag. While the price is very reasonable, this product is an easy wardrobe update. It's also worth taking a look at this Carven Satchel Bag. This product is extremely popular and, just as importantly, not very expensive.