Hi Don,
I understand that Cokin are in administration and this is probably why you can't get hold of their filters anywhere. Lee have lead times on most of their filters of 18/22 weeks.
Try Formatt Filters at
http://www.formatt.co.uk/stills-filters/products.aspx
I know these guys as they are based locally to me and I know that they have outlets in Canada. They make the filters to order and they can supply the hardware too. I have recently had a set of ND Grads, a set of Standard Grads, a set of Coral Grads and a 105mm Circular Polariser from them. I haven't used all of them but the quality really does seem good and their prices are quite reasonable.