Photo order supplies - like Mpix uses?

I'm hoping someone can recommend someplace to get supplies for photo orders. By that, I mean for when a customer might order 10 4x6 photos, 3 5x7 photos, and 6 8x10's. (I mostly shoot dirt car racing, and that is a very typical order) I'd like to find something like Mpix uses, the envelopes that are sort of like wax paper type envelopes.

The thing is, I don't know the correct name or term for them, and so I haven't been able to find anything by searching. Does anyone know where I might find these type of supplies? And even bulk lots of mailers to actually mail the order in?

What sort of things to you all use to pack and mail photo orders?

Thanks for any ideas.

Peace,
Paul

Trick answer, I don't. I use a service that does it for me.

I think these might be what you are looking for.

Glassine Envelopes from B&H Photo

Storage Envelopes from Adorama

Here are some clear poly envelopes for storing and displaying for sale.
http://www.jerrysartarama.com/art-su...es/online/5329
They have them in packs of 25 also.

Thank you Stina and Chunk! I've bookmarked those sites; now I know what I have been looking for!

You might also check local stores like Office Max, Office Depot, and Staples for those and mailing envelopes.