I'm surprised to hear something like that about Tradex Canada... oh well. In a pinch, you can order stocks from Finland. For example:
h ttp://www.euroase.fi/Tarvikkeet/Merkinnat/2011/9/4_Tikka_M55_kilpatukki.html
h ttp://www.asehuolto.net/Tikka-m55-matsaestysmallin-tukki-pientae-hankaumaa-vasemmassa-sivussa-muuten-tosi-hyvaekuntoinen
Not cheap, and you'd be buying one without seeing it... I'd go with gunrunner100's suggestion - unless the stock is that far gone that it makes the rifle manifestly unsafe, refinish it. You may be able to steam some dents out, and fill some gouges and holes. They will just give character to your gun (which is, by the way, a nice example of Tikka quality from the late 70's and early -80's.)