I was in a dollar shop, the mekka of all scrooges out there.
Purchased a pack of huge dishwashing sponges. I used the whole packet in less than a week. The reason for this is simple: the scrubbing side of the sponge easily comes off when damp. For comparison, these are normal dishwashing sponges, available in like any grocery store. It is very hard to remove the scrubbing side, and it comes off in chunks. Moreover, they are actually cheaper than a dollar. Dollar shops are a fine example of false economy.