All I can say in my experience not at corix but in general cash sales sometimes boil down to who helps you, how busy they are, how much they help you and so on. It "pays" to chat up the sales guy with what you're doing and sometimes you just luck out and he finds it interesting =)
Also, there are a couple of grades to some PVC stuff as well. Some things are CSA approved, some aren't, the ones that are cost more.
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