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Stainless 10mm Pall rings are being sold in pound and 1/2 pound bags now. Prices vary widely. hetp for these should be .10m to .15m.
They should work well in 2 to 3 inch packed columns. You should be able to get them for $12.95 - $12.99 per pound. One pound is about one liter in volume. Amazon is not your friend on this ($39.99). Saw another place at $49.95. Stillspirits is putting this out to replace apparently bad ceramic raschig rings in there turbo 500.
A couple of places with low prices Brewhaus America, and one called Austin something, and I believe eBay has a low price also.