Echo Store via Amazon discounts select Macbook covers, as listed below. Plus, Prime members qualify for free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it starts at around $5.) The deals:
Walmart offers the Urban Factory 17.3" Module 2 Laptop Bag in Black, model no. MOD02UF, for $12.04. Choose in-store pickup to avoid the $4.97 shipping fee. That's the lowest price we could find by $12. It features a padded main compartment, front pocket for accessories, various internal pockets, shoulder strap, interior divider, and inner retaining strap.