A4 card stock in the USA

[rjm]

That's one I just mentioned. I get it from Empire Imports, from New Jersey I think.
A box of 5 reams (1,250 sheets) is $125 from them. Should last a while.
Bob

[Kevin WS]

Remember to store your paper somewhere decent if you bulk buy.

In the box, away from heat and the sun, as well as damp areas or areas where there are temporary temperature changes.