Census Records - Choctaw County
I have found the following censuses online:
1840 Census Index (USGW Archives)
1850 Census Index (USGW Archives)
1860 Census - images are available at the USGenWeb Census project page.
They offer census records in printed publication and on CD. They have the 1840, 1850 and 1860 census books for sale for $20, $40, $30 respectively. They also offer the 1840, 1850, and 1860 census records on one CD for $20.