Do you have two ninja fan friends to share the contents of a box of 60 sachets with? If so, then you'll be happy to hear that it's now possible to pre-order a full box of The LEGO Ninjago Movie collectible minifig series sachets. at amazon (ref. LEGO 6175016).
In the box, three complete sets of 20 characters. Everything is currently on sale for the modest sum of 193.36 €, or 3.22 € per bag instead of 3.99 €.
Amazon guarantees that each order will be billed at the lowest price seen between the date of your order and the date of official availability of the product. If the price drops, it's a win. If it increases, it is the price displayed when ordering that is invoiced.
The same box is also currently displayed at € 219.99 at amazon Germany, but better monitor each European version of amazon (thanks to Amazon), the price being likely to drop by August 1st, date on which the box will actually be available ...