My husband always used Gilette Mach3 razors but with a pack of 8 refills costing well over $20.00 we started looking elsewhere and have found a comparable product at iHerb for US$7.54 - Personna Razor Blades, Tri-Flexxx, Triple Blade Cartridges for Men, 8 Cartridges
iHerb also has the Razor with 2 blade refills for just over US$4.00.
When iHerb has specials on postage I order a stack of refills. However you could even buy 2 x refills and have them sent airmail ($4.00) for a total US$19.08 (AUD$21.00), still getting double what you would buy here in Australia! With the current iHerb DHL 8lbs for $8.00 special to Australia it's a good time to stock up.
My husband loves these, he said they are virtually the same as the Gilettes.
PS iHerb has free full size samples of Sierra Bees, Organic Cocoa Butter Beeswax Lip Balm with Vitamin E, 4.25gms (MBE-00328) on offer too if you are purchasing other items. I've got a couple of these in different versions and they are awesome.
I have reviewed most of the products I've bought from iHerb on my iHerb page.
Feel free to use mine or any other Ozbargain members' for $5 off your first iHerb order. If your order totals $40 or more, take $10 off.
Real ozbargainers buy 100 Personna Red double edge blades for $30.