I keep a can of Burma Shave in my shower where I do all my shaving. Also, I've got a tube of Bald Guyz gel that I use on my head. I bought both of these before Christmas, shave pretty much everyday and I cannot sense that I'll need replacements any time soon. On my face I use an infinitesimal amount of foam-being in the shower adds moisture and assists the foam and shave with a Merkur razor. My head gets the Bald Guyz and a Gillette Mach 3. I tried the Merkur on my head and, apparently, I need some more OJT in using it on other than basically flat surfaces. And I'll tell you this, no matter what you use, it's impossible to shave a deep dimple with any system. I do think that shaving in the shower adds to the ability of the shaving media as well as the shavers. And, thanks to a tornado, I'm going to get a steam shower. That should make it possible to shave with a bread knife.
BTW...how many of you have seen the video of the guy shaving his head with a meat clever? He gets it as close as possible although as a viewer I had to avert my eyes when he was working around his ears...PJ