If you're a thrifty spender, your best bet is this hook + ALBERT Briefcase. It's a fantastic item, while not very pricey. In this price range, you can also consider this Shinola Briefcase. It's also a popular item and won't break the bank. You might also want to consider this Frye Briefcase. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're looking for something in between pricewise, consider buying this Shinola Tote Bag. While the price is very reasonable, this item is an easy wardrobe update. It's also worth considering this Fendi Zip Pouch. This piece is ultra popular and, just as importantly, not very expensive. And do check out this MCM Zip Pouch! It's a very popular item and good value for money.