You have to buy 5 items to get the BYOB discount.
I just picked up $252.30 (at ‘retail’) worth of items for $44.35, all told. And one of those was a bundle, where the ‘retail’ bundle price wasn’t reflective of the components. I couldn’t resist…14 items: 1 hair, 3 clothes, 3 characters/textures, 6 ‘locations’/sets, and one plugin. And I couldn’t even use my November coupon, as it would have only saved around $2, so I have that waiting.
I feel like I’m extreme-coupon-ing… It turns out the BYOB, and platinum items both count towards $30 of the B$30G1F (max $8.97) discount. Then the combination counts towards the $50 cliff to get the Joanie skin for free. Maybe it’s not intended to work that way, but I just picked up a TON of awesome content for a darn good price. $3.16/item if you ignore bundles, $2.77/item if you include them.