Chaps,
Having also lost the services of the lovely Chetna and Penny, I now source identical lenses through these guys, all done on line and with minimal fuss. They were the cheapest I could find but have given a good service to date (happily, my prescription is stable, but I have to use a local optician now like most others for check-ups):
LensWay - Contact Lenses
Easy to use drop-downs that lead you to the lenses you use.
Hope it's of use.
HH