2023 Washington Code 9.18.120 – Suppression of competitive bidding

2022 Washington Code 9.18.120 – Suppression of competitive bidding

2020 Washington Code 9.18.120 – Suppression of competitive bidding

2019 Washington Code 9.18.120 – Suppression of competitive bidding

2018 Washington Code 9.18.120 – Suppression of competitive bidding

2016 Washington Code 9.18.120 – Suppression of competitive bidding

2015 Washington Code 9.18.120 – Suppression of competitive bidding

2014 Washington Code 9.18.120 – Suppression of competitive bidding

2013 Washington Code 9.18.120 – Suppression of competitive bidding

2009 Washington Code 9.18.120 – Suppression of competitive bidding