Locksmiths have some pretty cool shit at their disposal. There is an instrument shaped like the original key that they can insert in the lock tumbler and obtain an "imprint" of the tumbler and in a matter of a few minutes have a new set of keys made with no disassembly required. This could also be done by removing the ignition yourself and bringing it to the locksmith.If you've completely lost every single key you have for your bike, which is what I'm reading here. You're looking at a new steering column... Unless I'm mistaken and the ignition is part of the gas tank on CBR 125's now? Not sure, either way. You won't have a lot of fun trying to get a key "made" for a motor vehicle.
to answer your other question, when I've needed blanks for my Honda, I ordered them from the Honda Powerhouse on the island. they're about $12.00 a piece. I'm not too savvy with mainland dealerships, but I'd try Carter Honda outside Kits.