What kind of bed liner do you have?

like the waterproof sheets.

I've only had mine for maybe four months and it is all ready falling apart.
It was like $15 from Kmart. I've gone through three of them now so I'm looking for something that will last.

I'm pretty sure mine is a sealy one, that I bought with the mattress. I've had it for over 3 years with no issues....I think it was $149 or something (king size)

ETA: I bought a $30 one for my sons double bed and it fell apart, so I got him an organic cotton waterproof cover that was on sale for $69, reg. $129 and its been holding up really well. My daughters I bought when I got her mattress (queen size sealy) and it was around $149 as well and its held up great (3+ years)

The mattress store near us sells them. I think they were $75 for a twin and went up from there.