I use the first type you show. I got 10 of them from a US based eBay seller for $7.50.
10 x 18650 16430 Battery Plastic Storage Case Box White | eBay
So tell me again folks, why can't B&M stores offer these at a decent price or even for free with battery purchases? Since most of them are buying everything from China anyway their costs should be lower than mine.
I think that American ecig vendor battery cases and other accessory items are marked up as convenience items that the ecig vendor knows people will pick up when they are ordering juice or atomizers. It's easy to click and add an order and the shipping charge doesn't change. Ebay sellers are obviously facing price pressure from direct China buyers who get them for pennies.