Brent, I stopped PWEs using pocket sheets a while back, choosing instead to use penny sleeves and then using either painter's or masking tape to put them together like they'd be in a folded 9-pocket page. that's also how I now send using the large business envelopes to Canada or elsewhere in the US. All that because I agree that those pocket sleeves are expensive and I hate having to buy them.
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“Aslan didn't tell Pole what would happen. He only told her what to do. That fellow will be the death of us once he's up, I shouldn't wonder. But that doesn't let us off following the signs.” - Puddleglum in The Silver Chair by C. S. Lewis