I bought a box of Personna blue blades from Amazon a couple of months ago. 100 count. Figure I'm good for at least 18 months or longer.
Cheap, too. $12?
I also buy my shaving soap from Amazon, the cakes of Van Hyusen. Nothing special, does what I need it to.
And a block of alum, and my shaving brush. Even bought a soap bowl from Amazon, but it's a little too small for the Van Hyusen cakes. I'm saving up my shard ends of glycerine bath soap, which I'll melt in the microwave and pour into the bowl.