Here I found the links for ya:
WSS GP rifle:
h ttp://ca.wholesalesports.com/storefront/black-powder/firearms/great-plains-kits-unfinished/prod182255.html
Pistol:
h ttp://ca.wholesalesports.com/storefront/black-powder/firearms/plains-pistol/prod192240.html
NOW none of that is to criticize the good folks at Dixie or Track - excellent companies. And both sell kits painlessly across the border (long guns, as noted above). And I love browsing Track's parts list, I am building a .36 for my daughter over the winter with their parts...BUT I'd suggest building one or two from a kit first because, if nothing else, it'll save you a lot of back & forth getting parts and such you didn't know you needed.
TOTW (and Dixie) also have GREAT books and tools to assist you...something WSS does not seem to have (well maybe they do I just can't find them)
Good luck - and have fun