im a little out of your area but just got our fall price list put together. We use springfield plastics tile from auburn illinois. Sometimes fratco but only when we have to. we also would offer a good discount for that size job your wanting to do.
4 inch .36
5 inch .55
6 inch .89
8 inch .1.56
10 inch 2.86
12 inch 3.71

installation would be
                plowed trenched
4 inch         .65       1.00
5 inch         .70       1.00
6 inch         .75       1.05
8 inch                     1.20
10 inch                    1.40
12 inch                    1.60 
$35 a connection
Extra backhoe work is $90.00 an hr.
Extra labor $30.00 an hr.