TTS is presently redesigning the supercharger mount in aluminum with an integral cover. This will replace the current stainless steel mounting bracket... and will raise the retail price from 2800 GBP (now) to 3000 GBP.
Due to the weak US Dollar, that's $5640 (now) plus shipping ($100-150). Expect the Dollar to weaken more, so with the new pricing, you could be looking at almost $6300 for the delivered kit.
The kit is not difficult to install, but if you want a good deal on
installation and dyno tuning, I'll get you a quote from Cycle Solutions (soon to be TTS Install Center).