The best price I found in Canada was Canadian Solar in Ontario - but the shipping cost doubled the tab. With shipping, the best price was Amazon.ca selling a Renogy 100 watt kit for $200 including shipping and controller, in 2014. I think it is more like $300 now with the reduced value of the CDN $.
I found that 100 watts was adequate to boondock indefinitely in summer, for fridge, LED lights and occasional use of the furnace in our small motorhome. If you watch TV for several hours in an evening, you would need another 100 watts just for it - and another 50 amp hours of battery.
A spreadsheet would be handy to calculate the amount of energy you want to use and from that and how sunny it is, the panel power needed, and the battery capacity to store what is needed overnight. I don't see how one could calculate the panel size from the battery storage a manufacturer happened to install.
