I got my glass vials from http://www.hsconline.co.uk/shop/catalog/bottles/clear
If you want them in a box http://www.hsconline.co.uk/shop/catalog/storage about 3/4 down the page
The box the vials come in is a ammo box, avoid vials with a shoulder, this can prevent all the powder from going in to the gun freely
2 grams is about 30 grains