Just what the title says...if you have a Sigma 300 f2.8 prime DG version that you don't use as much as you'd like, let me know and we can work something out!
Rick, I'm not sure but I don't think the DG version of the 300 2.8 is available yet. It's advertised but I don't think it's in stock until May (i just double-checked b&h's site and it's not coming until then).