Razor blades are expensive and do not stand long if You use usual shaving foam or shaving lather. But they stand very much longer if You don´t use shaving foam or shaving lather but pH-neutral liquid soap as EUBOS that You can buy in Germany - such products You should be able to get everywhere in the world, whatever may be their names.
You should try it: Shaving works no worse and You save a lot of money. I assume that the fact that most producers of shaving foam/lather are producers of razor blades, too, is the reason for that: They aren´t interested in a long standing of razor blades. Anyway there is a question that comes up: If razor foam/lather kills Your blades - what does it do to Your skin? pH-neutral liquid soap isn´t any harmful at any case.