a lot of the highest priced items are long store items - if and when they come on special, it would pay to stock up a year or 2's worth if one saved ??? 20 to 50% ------ that'd make 7 bucks cost look ok - particularly if there were a few on at the same time.
for years, I've used power shave razors and blades - the vibrating ones - they are a country mile better than anything else - but, the blades are as dear as poison - but, they used to last ages --- for about a year or so now - where I am - they last -- I reckon a third of the time they used to - something has changed - and, it's changed the whole quality of the shave and the economics -
the price NEVER changes. Even though I don't budget - that kind of thing gives me the poops. So, I'm on the lookout for a replacement.