€35 will bag you this set of bright 4ml minis from Nails Inc, along with a base and topcoat - but I didn't put 'em in the picture because they just weren't pretty. It's a steep price - especially when you consider the sterling charge is £22, but putting that particular bug-bear aside, I wanted to see if it represented any sort of value.
So I worked it out: a full size at 10ml (thanks to Twitter for confirming this!) generally sells for €14 or so. With this set you're getting six small shades plus your base and top coats, which works out at 32mls, or roughly the price of two-and-a-bit full sizes. If you think that's good enough value for doing your own skittles manicure then you'll find this at big Boots and Nails Inc counters.