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13 CFR 125.20) says contracts can be awarded without competition under some conditions and other regs can limit contracts to 8(a), HUBZone, or SDVO SBC for competition..
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§ 125.20 When may a contracting officer award sole source contracts to SDVO SBCs?
A contracting officer may award a sole source contract to an SDVO SBC only when the contracting officer determines that:
(a) None of the provisions of §§125.18 or 125.19 apply;
(b) The anticipated award price of the contract, including options, will not exceed:
(1) $5,000,000 for a requirement within the NAICS codes for manufacturing, or
(2) $3,000,000 for a requirement within all other NAICS codes;
(c) A SDVO SBC is a responsible contractor able to perform the contract; and
(d) Contract award can be made at a fair and reasonable price.
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