I am not sure what trekking gear shops you find in the Patan area.....but there will be some. If you go to Thamel (the tourist area) there will be one on each corner and plenty in between.
In the Eastern side of thamel, you find Tridivi Marg and nearby you find 'Shona's'. They sell and rent out good gear. And typical you can rent a sleeping bag for 1-2 usd per day. The Price if you buy depends on the quality....but it will be way cheaper than buying at home.
Ok, great, that really helps. Thanks!
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