Because of the shipping cost being way more than the component cost I have a business account with Mouser and create 'BOMs' using Mouser's web page and just drop a single order to get a few dozen spares in one fell swoop.?
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(under [accounts and orders], [BOM's] )
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They also do have some minimum purchase quantities on some components so you need to watch for that as well. They are not going to sell you (1) C0G capacitor at $0.19 each, that is not how their business model works. You may need to be prepared to buy quite a few things. They are not like the Radio Shack of components but are more inclined to businesses that spend hundreds or thousands of dollars on a single Purchase Order.
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Tisha, AA4HA