Cost of GCPs in USA

Can anybody let me know how much would it cost to collect one Ground Control Point with an accuracy of 1 cm using Dual Frequency DGPS?

Way too many variables to say.

Swift Navigation offers their Piksi Multi GNSS Module with cm-level accuracy for $595. Perhaps this might be of use to you.

Regards,
Terry.

Thanks SolarBarn…hope to reach you when required to do GCP survey.