Buy one get one free

I want to talk about these deal "buy one get one free"
it doesn't matter if this is for a windows or carpet or anything else
in 99% of the time there is a catch and if you don't read the fine print
they will get you. Lets talk about carpet the big company buy it for
let say $0.40 sq.f. and they sell it to you for $1.45sq.f. and when there is a sale
they will charge you for things that are normally included in the price like
old carpet removal, new pad upgrade, garbage haul away.
So at the end you may save a few cents per sq.f. but you still
will pay more than if you buy your carpet from a smaller company