Hi guys, I have previously purchased these metal shotbox carry cases and found them to be excellent for carrying 5 full boxes of shotgun cartridges. The compartments can also be adapted by moving the inserts to accomodate other sized items as required, they are great quality and are lockable and come with a carry strap also.
I believe I have previously paid around £20 each for mine but I have just found them on eBay for £9.99 including free delivery! They are being sold by Edgar brothers. Pick yours up before they run out. They are available in several colours.
They have other items that are well worth a look at also.
Hope this helps, apologies can't get the link to work but enter the eBay item number below.
ebay number is 300627478730