McMillan inlets for Tikka T3, but it would be difficult to find in stock anywhere, and you'd likely have to order direct and wait the 7+ months.
Your cheapest option is likely MDT's LSS chassis:
http://mdttac.com/lss-chassis-for-tikka-t3-sa.html
Canadian company, heard lots of good things about the LSS.
Boyds has a laminate thumbhole option now, I believe its the varmint version, not the featherweight.
Lastly, is the GRS stocks.
http://grsriflestocks.com/
Can order direct, or I know a few Alberta vendors stock/order them. RPS in edm, and red star target co. in calgary do for sure.
AI AICS chassis is supposedly due to be stocking in T3 inlets soon I hear.
Also Mountain Tactical stocks on tikkaperformancecentre:
https://tikkaperformance.com/index.p...oduct_id=56297
Hope that helps get your search started.