Hi! thanks, I'm glad you like the collection :)
The complete Bundle is already 80% Off, so I can't offer further discounts. The 50% off coupons are for buying individual packs.
The cheapest deal is the complete bundle, however, some people prefer to buy the packs little by little as they need them for their projects. In that case, the 50% off coupons come in handy.
If you have any other questions let me know.