Chazz,
Since your a fellow Canadian, KBC Tools stock way oil in small and large containers. But prices from KBC Canada are for most things far higher than from the U.S. Due to your location, Shipping is going to be a factor no matter where you mail order from. You might try a visit to a local bulk fuel/lubricant dealer. One problem with that is they do deal in bulk supplies so most times the minimum is a 5 gallon pail. But they might be willing to order in a couple of one liter containers for you. Failing that you might want to try a few auto parts stores in your area. If it's a decent auto parts store with a knowledgeable person behind the counter then most likely they can get it for you. Try a parts store that caters to the loggers. Also you might ask at a few local machine shops about where they get their way oil. Any oil is better than no oil but automotive high detergent motor oils are NOT compatible around bronze like whats used in your leadscrew nuts. I'd recommend Vactra no. 2 way oil. Your city is large enough that somebody will have it or can get it. I live in a small B.C. town so I'm very familier with the problems just trying to find what you need. My mill is a bit larger than yours so I just ordered a 5 gallon pail after I got my mill and figure there should be some left at the end of my lifetime. Using the proper oil and regular applications is the cheapest preventitive maintenace you can do. I'd also never use grease as oil is thin enough that it helps to flush out cutting chips and the minor wear particals that result from just using the equipment. Proper way oil also has additives that help retain the oil on the ways and prevent stick/slip problems that can happen with closely fitted surfaces.
If that mill is something you just bought then I'd also highly recommend pulling the table apart and cleaning out the rust preventitive grease used at the factory on the leadscrews and table ways.. None of the HSM type mills are machined or assembled in anything that could be classed as close to clean room conditions. Your mill will last far longer and work much more smoothly if you do this. I used a grease cutting solvent to clean mine. It's not a hard or complicated job to do and I make a point of pulling my table off once a year just to clean any wear particals out, And for my mill verify that the one shot oil system is pumping oil to every area it should.
Pete