Listen to what the folks are telling you about grinding your own.
Personally, I don't like the chrome finished screw drivers that come from Canadian Tire. Just my personal preference. The steel in them isn't bad.
I go to yard sales and pawn shops for my screw drivers. This includes flat, Robertson, and Philips heads. All can be carefully ground to fit. Especially when some screws in antique firearms are buggered. Many times, those screws can be peened and re slotted with sharp, square sides and saved. The same goes for Philips and Robertson styles.
Torx heads and screwdrivers are a whole different ball game. Allen head screws that have been stripped, can often be taken out with a custom ground allen wrench. No way to fix them, but at least they can be taken out and replaced.
Poor fitting screwdrivers are a recipe for disaster. They slip and cause gouging on stocks and metal, or they cause galling on the lips of the slots etc.
The same goes for those lousy, cheap, soft screwdriver heads that come in most sets. They just aren't rigid enough and cause damage, even if they fit.
$20 at a garage sale or pawn shop will yield a half dozen very good quality, non chromed screw drivers with hardened shafts, as well as hardened blades.