If you're looking for a good deal, look no further than this Marc Jacobs Satchel Bag. This item doesn't cost too much, but absolutely invaluable in your wardrobe. You might also be interested in this Marc Jacobs Tote Bag. It's an attractive option both price and quality-wise.
If you're looking at it like an investment piece, then what you're looking for is this Marc Jacobs Handbag. It's more expensive but worth your money.