Broadleigh Gardens has

http://www.broadleigh-bulbs.co.uk/cgi-bin/cp-app.cgi

Schizostylis should be planted in the spring, so you might want to wait and get them next year.

Good point Bamboo

they are in the garden centres now as thy are coming into /are in flower now. so buy the plant and pop in the ground now. its more of a rhizome than a bulb/corm though.