Universal Cardboard Dividers 595x195 mm at low cost online, 0,89 €
One Piece Postage & Mailing Box 8349 with Divider Insert - Kraft Brown (MTO)
Amazon.com: Chipboard Box Dividers 49 Cells for 2 oz (60ml) Boston Round for eLiquid Vape Juice, Essential Oils, Cosmetics etc. Fits Inside Any 12 x 12 Box Like Large Flat Rate USPS