We used USInspect for our rural purchase in 2013.
They did a thorough inspection and gave us a detailed report.
Charged as follows:
HOME INSPECTION $365.00
WELL FLOW $50.00
SEPTIC WALK $50.00

The seller paid to fix a few of the issues noted in the report.

We easily performed the Well Test ourselves - through the El Paso County Health Dept.

Septic certified inspection cost us $200

The realtors paid for the cost of having the septic pumped - believe it was around $450

We also had to pay a prorated Propane charge for what was in the tank at time of purchase.