Questions about diffraction gratings.

I have a few questions about diffraction gratings. First of all, what types of diffraction gratings do you use the most? And for what reasons? Lines/mm or inch, Linear/single axis or grid/double axis.

I've been looking and it looks like I would be able to sell some of the cheap diffraction gratings for I think a little less than $3 including shipping and PP (inside the USA). If I use normal letters for the "shipping" I can make sure that the shipping to the customer is not too much. Do you think that would be a good idea? The cheapest ones I can find in single quantities are $5.
So I figure that maybe I could help out a few people that want cheaper gratings.

Any thoughts or comments are welcome.

or is this just a crazy idea...

Sounds interesting, specially if you can source hard (not bendable) ones.

The one I use the most is 1000lines/mm, linear. I use it mostly to see the spectrum of lamps and verify if two lasers are of the same wavelength.

I'd buy some and being in the same state shipping should be easy

Unfortunately these would be the cheap, bendable plastic kinds.

Atomicrox said:

Sounds interesting, specially if you can source hard (not bendable) ones.

The one I use the most is 1000lines/mm, linear. I use it mostly to see the spectrum of lamps and verify if two lasers are of the same wavelength.

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