I paid under £300 from my supplier, and these are brand new, which is a bonus for me. I did consider S/H Xenons, but then the idea of mucking about with looms, fitting washers and levelers etc made the job a lot bigger and more complex. These Hellas are plug and play and with some decent bulbs as the OP stated, are a big upgrade it would seem.. Almost as good as Xenons!
In some way's these are cheats way to having that Xenon look.. I guess as the name suggests!