A year ago I surveyed the costs of Illumina library prep and found over 15 providers; they offer generally the standard Illumina library prep method but with prices ranging from £15-£60 per sample. There was some real innovation amongst some of these kits too, enabling methods and applications not supported by Illumina (in the way of TruSeq kits). Illumina have created an ecosystem for other companies to feed on.
With the developments coming thick and fast from ONT and the people taking part in the MinION access program I wonder when the first nanopore kit might be released by a 3rd party? I'm sure a similar ecosystem will be created as MAPpers release protocols and the system becomes more widely adopted.