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I've got a couple of bikes with cartridge type brake blocks so did a search to buy some to keep in stock and came across these at Halfords: https://www.halfords.com/cycling/bike-parts/bike-brakes/55mm-cartridge-for-shimano-sram-and-tektro-with-triple-compound-pad-225885.html?stockInventory=undefined
£1.50 a pair. Bargin.
If you buy on line for in store pickup it limits you to 2 pairs for some reason. When I went in to pick a pair up I got talking to the guy on the counter and he said that they had some in stock and if I wanted more he would price match the online deal even though they were marked as £4.99 now. So I've gone back today to get some more.
Thanks Mr Sparkle, I've just bought 4 sets of vee brake catridge inserts for £! each to replace stock.