Pulled info below from the website, think the Saturday Malaga flights will be around £110 ish plus bike bag costs £27 each way now. Flight examples attached leaving London on 17th :
http://www.easyjet.com/EN/Booking.mvc•Switchbacks guided weeks for 2012 cost 675€
•600€ for returners or groups of 4 or more.
•475€ long weekend costs: includes 4 nights & 4 to 4. 5 days riding.
•425€ for returners or groups of 4 or more.
•Single/ few day trips available (contacts us for availability and prices)
•Costs include: FREE tuition, guiding, full-time vehicle shuttles and support, airport transfers, uber-villa with SKY TV, WIFI, laundry facilities, kitchen, salon, BBQ terrace, pool, gym, football pitch, secure bike storage etc.
•You will need all your regular riding kit plus elbow, knee/ shin pads, about €200 spending money, and INSURANCE – a proof of medical insurance covering you for mountain biking and/ or extreme sports just in case. No insurance – no riding! For European citizens this must be supplemented by a European Health Card available online