I know what you mean.
I spent three hours cross referencing stock/part numbers through GSA contractors and subcontractors to make sure what we were ordering was what we were required to buy, and then filling out additional paperwork.
For that three hours, I "saved" the government 10 whole dollars!
for my purchase at having to pay approximately $3.00 more per box, it will cost the government $900.00 more for the 300 boxes I need.