Don't' make purchase decisions based on price, look for the value.
Often extremely cheap options have less paper around the tube and will cost more in long term. Also irritation or/and micro cuts from low quality toilet paper are not uncommon.
There are so many different options out there so you must test at least few of them yourself to be sure.
We have tested many toilet paper brands from across the world and we know that the number of layers does not show the quality.
There are 2 ply papers that have really high quality but also 4 ply papers that are so thin that you can almost see through.
Too many customers focus on how many layers toilet paper has, but it is too often used as a marketing trick, because many consumers tend to assume that more is better, sadly it is not the case.