got cheaper. I know I don't use their oil filters anymore. I've noticed decrease in quality. I think for an air filter, they're still decent and have the best prices going for most apps.
I too have stopped using Purolator oil filters. I cut a new one apart before Purolator was bought out and the leaf spring was not stamped properly. IMO the filter element would have probably shifted in the can under pressure allowing oil to be unfiltered. I now use ACDelco Duragard oil filters and WIX filters for everything else.