Did your organization get a grant from a Federal agency under the American Recovery and Reinvestment Act?  If so, congratulations, but you need to start thinking about the process by which you go about spending the grant money.  Your procurement process will need to conform and comply with the corresponding Code of Federal Regulations (CFR) and with any grant-specific procurement requirements.  If you've just started looking at this, you know there's an appropriate amount of red tape involved (hey, it's my tax money and I want to make sure it gets spent properly so I'm OK with a little red tape).  The good news is that most Federal agencies have very similar CFRs as they relate to the subject of procurement.  For example, the procurement regulations in USDA's 7 CFR 3019 look very much like those contained in USAID's 22 CFR 226 which look very much like those contained in DOE's 10 CFR 600.  (However, there are nuances from CFR to CFR.)  I recently drafted a procurement policy and a Master Purchase Agreement to comply with the DOE codification of OMB Circular A-110 at 10 CFR 600.  My work (attached below) is yours for free.  As implied above, you can easily convert this work product from DOE to USDA to USDAID to any other Federal agency.  The attached Master Purchase Agreement contains all of the contract provisions required by 10 CFR 600.  Both the attached policy and the Master Purchase Agreement contain specific CFR citation references, so you don't have to figure it out for yourself as to where the content was derived from.

P.S. and a disclaimer:  The attached are "as-is" without any representations.  The Internet is still the wild, wild West and my work product is free, so use it at your own risk