It depends on the letters and how long you want to wait, but some of the recent LL.ca sales I've seen from major domain venues are in the 4-figure range. One I remember very distinctly was SI.ca, which sold for $4,999 USD, as well as UP.ca for a little over $5K USD. I think KQ.ca sold for under $1K.
Private and more esoteric venues move into the 5-figure range, like DT.ca and AR.ca, but both are premium letter combos and the seller likely didn't need cash anytime soon.
Selling for 6-figures is very rare, but it does happen, and is likely the result of a long-term negotiation over several years. That kind of major transaction doesn't "just happen" and I think a lot of these LL listings above are simply lottery tickets.