As your a "newbie", I would not recommend used and the Knew is likely to be outside yout budget, soi I'd buy new for peace of mind and buy it now. If you wait for every possible bargain, you might never buy anything.
I have a KP and it's a fine camera but the similar specification K70 has also had very good reviews and is cheaper and lighter, It also comes with your already specified 18-50 lens and both lens and camera are weather resistent, which is ideal fo travel. So I think that's what I'd buy if I were you.
I know you mean well, but do you realize how tiny the used Pentax market is, especially in Canada? I ended up getting my KP new at a fire sale price because the used market for any modern Pentax equipment is non-existent here. It took me ~6 months of searching the Canadian classifieds, Pentax Forums, Fred Miranda and Reddit every day to find a used DA* 300mm f/4.
My recommendation to him would be if he can wait until Black Friday, see what Amazon does with the KP. It was on for $700 CAD earlier this year, so they might do another sale to clear out the remaining inventory. If nothing happens on Black Friday, then they have the K70 + 18-55 on for $800 CAD and that'll leave him with $500 to grab a few primes or the 55-300mm PLM.