eBay / online sellers 150 x 12x9x4" A4 MEDIUM SIZE CARDBOARD PACKAGING BOXES conform to Royal Mail / Hermes Small Parcel size 17.8p each Free Next day postage on orders over £14 @ Globe Packaging on Amazon £26.70
How low can it GO?!!
Flat Pack Single Wall Boxes A4 Size 12x9x4" (A4 Size Base, 4" High)
Ideal for Office Supplies & Home Use
Brand Globe Packaging
Product Dimensions 30.5 x 22.9 x 10.2 cm
Material Type Cardboard
Similar sized product in the post office http://shop.royalmail.com/mailing-boxes/stripey-gift-mailing-box-318mm-x-224mm-x-80mm/invt/vow_101-3095
Only £3 each
If you know where to get the same amount cheaper please share
I have used this seller and these boxes & can recommend. Usually buy 100 at £21.50 for 100 or 21.5p each. Thought this was worth the slight extra spend to save a few pence!