Unfortunately Dell are none too clever with their responses.
If you particularly want a Dell machine and no monitor, you could try click here
They supply new and refurbished PCs from many manufacturers, including Dell, and have some pretty good machines at good prices.
I don't have any experience of buying from them but colleagues of mine do and they seem OK.
If you are worried about buying refurbs, you still get the same warranty as a new Dell PC.
Maybe worth a look if Dell can't be arsed with supplying you direct.