D.C. Mun. Regs. tit. 8-B, § 3501
3501.1 A procurement for services in an amount of two thousand five hundred dollars ($2,500) or less, or a procurement for items other than services in an amount of one thousand dollars ($1,000) or less, may be made without obtaining competitive quotations if the contracting officer determines that the price is reasonable.
3501.2 Non-competitive small purchases shall be distributed equitably among suppliers. When practical, a quotation shall be solicited from a vendor other than the previous supplier before placing a repeat order.
3501.3 The contracting officer shall take action to verify that the price paid for an item or service is reasonable in the following instances:
(a) When purchasing an item for which no comparable price or pricing information is readily available (such as an item that is not the same as, or is not similar to, other items that have been recently purchased on a competitive basis); or
(b) When the contracting officer suspects or has information (such as comparison to previous prices paid or personal knowledge of the item involved) to indicate that the price may not be reasonable.
SOURCE: Final Rulemaking published at 39 DCR 2566 (April 10, 1992).