New, final price is +shipping and paypal fees (if applicable). You will need to supply disks and brake lines if you're converting from 2pot fronts, see bottom of the post for the other items you'd need to purchase (discs, lines).

$1100 USD includes the front calipers, caliper bolts, and ferodo pads. Each caliper is $788 if you buy from lotus.

Link to the best option I have seen for discs (credit Ghia914):
Brake lines available here: Goodridge 4 Pot Caliper Brake Hoses | EliseParts

Since Lotus has made more than one brake kit and questions have been asked, here is lotus supplied information, with the info relative to these calipers highlighted, from Service Bulletin sb_2009_01_track use:

Product Font Screenshot Circle Number