Check the leon mk1 section on the forum, massive thread about cheap HID's.
www.mydepots.com
Work out about £63 delivered. I'm just about to order some!
To get bi xenons you need two kits, I believe as the dipped beam and main beam are seperate bulbs on the ibiza. All my friends have xenons and say you dont need it on main beam as dipped beam is so good you'll never use it