I just did a little comparison between ordering from Dollar Shave Club and Dorco Direct.
Dorco offers a couple more options than DSC does, basically a 2 blade, 3 blade, 4 blade, 6 blade and a 6+1 with a trimmer on the back. DSC offers the Twin, the 4 blade and the 6+1.
For comparison, I'll list those 3's prices from Dorco as well as DSC.
Buying in bulk, the twin blade works out to $.77/cartridge versus $.25/ea from DSC.
The 4-blade bulk price works out to $1.17/blade whereas DSC gets $1.50/blade.
The 6+1 or "Executive" as DSC calls it is $1.43/ea in bulk or $2.25/ea from DSC.
If you're a bare-bones kind of guy and think the twin blade is for you, DSC is far and away the best option. They're essentially giving them away.
For the 4-blade, I'd say it's basically a wash. You can save a little, but that $8 every 6 months is probably offset by shipping (Free with DSC) and when you factor in convenience I might give the nod to DSC.
Where you see the biggest savings (or where DSC is making its money) is with the Executive. It's about 2/3 the cost when you order refills from Dorco. Even still, I could see someone justifying the extra $3/month for the convenience of "they just show up every month". Again, part of that is offset by shipping cost (which I couldn't see without checking out).
Another tip, if you want six blades and don't need the extra "trimmer" blade, Dorco offers a 6-blade without it, and that'll save you $.10/ea over the 6+1. (The 3-blade is $1.01/ea.)
Either option saves you gobs over going to Walmart and picking up a 12-pack of Gillettes, that's for sure. I really can't speak to the quality.
ETA: The $1/month plan is actually $3/month because it does not include shipping, like the others. That makes it $.60/cartridge, still cheaper than buying from Dorco.
Also, I don't know why this post got put where it did. I clicked reply to thread.