Walmart offers the Hyper Tough 12.5" Toolbox with Organizer in Black for $3.87. Opt for in-store pickup to avoid the $5.99 shipping fee. That's $2 off list and the lowest price we could find. It has an interior tool tray and measures 12.5" x 7.3" x 5.2".

Update: It's now available for in-store pickup only.