If you'd rather not spend much, your best bet is this Innue' Satchel Bag. It's a popular product, while not very expensive. Another strong contender for your wardrobe is this Buti Satchel Bag. While the price of this item is rather reasonable, it will surely attract a lot of attention. You may also want to look at this Satchel Bag. This item is not expensive either, but it will make a difference in your wardrobe.
If you're looking for something in between pricewise, consider this Sergio Rossi Satchel Bag. While the price is very reasonable, this item is an easy wardrobe update. It is also worth looking at this Carven Satchel Bag. It's an attractive option both price and quality-wise.