Is there any alternative that can be used for this razor? I like it but don't really $60 for 10 cartridges like it since I go through a cartridge in a little less than 2 weeks, I shave my head at least every other day. I got a 5 blade Harry's razor and it's alright and much cheaper but I do miss the swivel head. So is there an off brand, or just cheaper alternative cartridge, I can get or is it just $60 for 10 or nothing?