I always send bids in from non SAM vendors because our SAM vendor list here is quite short. I have much better luck with my crew and now that the AMs I work with have seen my crews pricing - they want a non SAM vendor bid as well. The 571 is how I submit the bills, but depending on how much the bill is - it is sometimes a 1093 payable to me. Ask your AM if they want two bids - and ask if you can submit one bid from a SAM and one from a non SAM.
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"No cause is lost as long as there is one fool left to pursue it". Wil Turner