[Source] Repair envelopes

Does anyone have a good source for 3-part repair envelopes “cheap” ?
lol (I know there not) I need to order around 3000-4000 qty.
Thanks so much…

Paul Coca

Impact has great ones and they carry the one I designed:
www.isiprint.com david Geller

Rio Grande makes a decent priced 3 part envelope, only you use the
appropriate sized zip lock bag to place the paper and the item in.
The plastic bag is reusable each time. It seems somewhat expensive
the 1st time around, because of the heavy guage plastic bag cost, but
it actually works out dramatically less in the long run than any
other 3 part solution I have ever come across. Ed