Hands down, the US Personna 100 pack for about $12. They are sharp, smooth, and long lasting. While Astras and Rapiras are cheaper, the Personna offers more shaves so is better bang for the buck.
Where did you find that price at ??1. Voskhod- $7.83 per 100, delivered. They combined shipping for that total.
Where did you find that price at ??
Your own math proves the Voskhod gives you the most shaves for the least cost at .0035 cents per shave.
Also, it says the Feathers only give you .1 cents per shave, which is the least cost effective blade of the four.
Even if a pack of 100 lasts 8 years, it is almost 3 1/2 Times the cost of the Voskhods.
So, if you spent as much on the Voskhods, as you did on the Feathers, you would get roughly 17.5 years of shaving, with the Voskhods.
The math is done in my head, so please don't quote me. 8.2 vs 17.5 years, big difference.
That aside, I still enjoy feathers the most.