i can see on the TSH the shopping channel anymore and not much wall mounting options now, are they going out??
40 inch tvs going out? or even 40 inch 4k tvs...!!?
Unless you're going to drive down to the USA, don't bother looking at US stores.
When I went looking for TV's awhile back..... it was like 50" was optimal price and then it went exponential. Are you seeking 40" because of a specific size limit in your room?
Doing a quick check on Best Buy, I think there's about a dozen to choose from....