Clematis Nelly Moser

'Nelly Moser' is a clematis which I'm considering for my new trellis obelisk. This  Group 2 variety has been around for many years, is ideal for containers and is happy in shade. I'm hoping that I will be able to buy a nice one locally, but I may have to resort to mail order.

Duchy Nursery (Duchy of Cornwall) http://www.duchyofcornwallnursery.co.uk
8.50  for a 2.5 LTR deep pot + £10 for courier delivery.
Crowders http://www.crowders.co.uk charges 9.99 for a 2-3 LTR pot but I couldn't find out how much delivery costs and free delivery only kicks in on orders over £50.
Notcutts http://www.notcutts.co.uk charges 11.99 for a 3 LTR pot with free delivery.
J Parker Bulbs http://www.jparkers.co.uk charges 15.98 for three 2 year old pot grown clematis or 7.99 for one/15.98 for three plug plants. I couldn't find details on delivery charges.
J Parker Bulbs supplies the clematis plants for Daily Mirror Reader Offers  http://www.mirrorreaderoffers.co.uk The deal there is one 2 yr old pot grown Nelly Moser for 7.99 or two for 15.98 plus one free, with 3.99 for postage.
Van Meuwen  http://www.vanmeuwen.com doesn't sell that variety
Crocus http://www.crocus.co.uk does a 2 LTR 60cm cane pot grown for 8.99 plus 5.99 postage.

So all I need do now is find me an i-banker to work out the best price !