Devon;
2- MNIB
Just remembered another possible source, of Aristo’ twin flats packs via our regional g-gauge vendor ! Sent ya a PM with that contact info.
YYC = Calgary, the other side of the continental divide ! Home of Canada’s largest train show, http://www.supertrain.ca/
Jeepers according to google maps it is only a few min. further, direct to here from PostFalls vs Nelson, b.c. probably ‘cause it is further west in another mountain valle’. Too bad your son’s league is not affiliated with a southern Alberta league but the mtns will do that 
Shucks maybe ‘roll-the-dice’, for if the exchange rate is basically the same in April make a run up to the show . . . you would not be the only u.s. train fans to pop up for it !
doug c
p.s. Nooow if your shortline needed a back-up to that GP (ex.?), you might also been interested in at least another GP (MNIB undec’d, 210usd +s’) to represent another GP unit (101,or 103?) or even a (fantasy) shortline-sized MNIB undec’d 44T (190usd +shpg) 