I have been using Astra Platinums and Derby Extras, but have been using some of these from a sample pack. I have to say the Super-Max Platinum is a very underrated blade.
I've not used this vendor before, but have placed an order; the price is right - under $.08 per blade.
I'm not affiliated with this vendor in any way.
Let's see, that means I'm now up to 800+ blades in the vault. Should last for a little while...