Should have checked the Amazon Canada website for you. Sorry. Yes, test strip prices in Canada are much higher, even on the Amazon.ca website. Too bad you don't live close enough to the border to shop in the US for test strips.

Or have a friend that can ship them to you. Some members close to the border even got a post office box in the US and had shipments sent there. Drove over once a month or so.
Ebay? but check the expiration dates?
Food labels in the US don't show carb content either. But a wonderful vet has put together a chart, link is here for you >>>>
Food Chart that lists the carb content of many foods. The list is a bit outdated, 2017 but it's the best we have right now. I know all these foods may not be available in Canada, or may have slightly different names. So ask if in doubt. You want to look in the 3rd column for appropriate lower carb options.
There is an ever older list that has a very limited list of cat foods in Canada.
Food Chart
Really old, hasn't been updated since 2015. It was also compiled by someone that did not like particular ingredients in the food such as artificial colors or carrageenen.
Only canned/wet/pouched foods are listed as well as the foods sold only at vets, "veterinary prescribed". Newer foods are not on the list. Cat food manufacturers come out with new products all the time, to tempt cat owners to buy them. Not necessarily better. Simply marketing to consumers. So are those "veterinary prescribed" foods, and you'll see when you look at the food chart, how high in carbs many of those foods are.
You want to look for foods that are lower in carbs. Here, <= to 10% is recommended.
(2018) AAHA Diabetes Management Guidelines for Dogs and Cats. AAHA diabetes guidelines say <= 12 %. Some cats actually do better on a bit higher carbs than the absolutely lowest carb foods available. ECID Every Cat is Different.
How much to feed. In general, 6.8 to 9 calories per kilo (15 to 20 calories per pound) of ideal weight. Hopefully I did the conversion to kilos correctly.

So what is Georgie's ideal weight? Too skinny now? Too fat? Just right?
Weighing your cat once a week or so, holding him in your arms and stepping on a scale with him is close enough to judge. Weigh the both of you, note the weight, let Georgie down, note your weight, subtract first number from the second number to get a rough idea of Georgie's weight.
p.s. As you can see, I like to be thorough. Succinct I am not.