I can't tell you which shops have better prices in your area. I can reaffirm the notion to stay away from the blue stuff, I don't care WHAT brand it is. I would try setting up a drip system if you can swing it at all, it will allow you to use a lot less water while keeping soil moist through the days, weeks and months, rather than allowing the volume to dry out, which is stressful both for plants and for soil biology.
You can feed with pee, if you can provide enough pee. You can also go with soil amendments, your best bet would be to go through the Post Your Organic Soil Mix thread for recipes. You can also feed using fermented plant juices or extracts to a very large degree. If you want a one-part feed, then I would go with Fox Farms Big Bloom + soil amendments that would include stuff like kelp and various rock dusts to account for minerals, because it sounds like the mix you're going to use will have plenty of organic matter.
IIRC, the glacial rock dust takes 2-3yrs to become bio-available, should be treated like soft rock phosphate (SRT).
There is no reason NOT to use whatever sugar you can find or have on hand. I've experimented with many, many sugars, they all work. Some are better than others, in my opinion pretty much anything that's brown is going to have more nutrients available than white sugar. However, the goal is to grow bacteria with it, not provide nutrients, so use the white stuff, just go easy with it.
And, seriously, learn about fermented plant juices and extracts. ;)
