I've been watching the prices on Personna Labs lately. I bought 100 of them last year when they were about $12.50/100. These Personnas have become my favorite blades. I like Feathers too but the Personnas just edge them out and they're cheaper. So I've been buying a couple hundred here and there when the price dips on Amazon. Not sure if anyone else is looking to get some but they were down to the lowest price I've seen last week - $11.35/100 so I bought some more. Now they're back up to almost $12 - still pretty good.
I just bought my 3rd box of 100. I paid around $12.50 per 100. This is the only blade that works for me in my R41. I'd recommend these blades to anyone looking for a good blade. Thanks for the lead, on to box 4. Edit: 2 boxes of 100 $19.99 on Amazon. Plus $4.49 shipping, spend $35 (easy) free shipping.