Where would one go to find the cheapest prices on API (or other brand) 500 series lunchboxes? I suppose used on eBay would be the cheapest, but they seem to be relatively scarce there.
Depending on your intentions or timeline on filling your future lunch box, I believe there are some dealers offering a free API 6-bay lunch box with the purchase of any four modules... so, that would pretty cheap if you plan on purchasing a few modules at the same time ... just a thought.