I know that if you go to a large paper products store, Expedx for example, they will, for a price, cut down larger stock paper into any size you want down to the 1/32". Several years ago I got about 500 sheets of 45#- 23x30 card stock cut into about 4 different sizes for around $20 US.
Now it's been a few years and I'm sure prices have changed, but it's worth checking out just for the time saved in doing the cutting yourself..
good luck,
SFX
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