Shop the above list of suppliers for the type of steel and style you want. Some of them offer the same style blade in different types of steel. For a few dollars more, you can often get a premium stainless, or D-2 (technically not stainless, but very close) that will hold a superior edge. If they advertise the steel as just "stainless" or call it "400 series stainless" you don't really know what you are getting. There is a world of difference between 400A and 400C stainless. Assuming a decent heat treat of both, the 400C will hold a good edge longer. D-2 is a couple points short of enough Chromium to be classed as stainless, but it makes one heck of a good blade that won't rust while you watch it.
ATS-34 or 154CM are pretty much the same steel and are offered by many of the suppliers. They will last though several animals before you have to touch up the edge. I once field dressed 3 wild boars in Germany with my ATS-34 blade. You could no longer shave with it, but it would still slice newspaper cleanly and took only a couple of swipes on a ceramic stick to bring the edge back.
A dirt-cheap piece of stainless will not be any better than the stainless kitchen knives you can buy for a couple of $ in the grocery store and will last about as long.
Have fun putting your knife together, but be aware it can be a progressive disease that can lead to producing your own blade from a steel bar and then, before you know it, you have a new hobby.