The purchasing unit is exempt from the operation of the mandatory provisions of section ten, article three of this chapter when:
No purchasing unit may evade the intent of this section when required goods or services are reasonably available from nonprofit workshops: Provided, That if a purchasing unit is required or may be required by federal statute or regulations to purchase commodities or services with competitive bidding, or may otherwise be disqualified from federal funding or assistance if it fails to purchase commodities or services with competitive bidding, the purchasing unit shall not be required to purchase commodities or services from nonprofit workshops. Such purchasing units not required to purchase commodities or services from nonprofit workshops include military installations of the national guard.
W. Va. Code § 5A-3A-6