Ways to Short Commodities?

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A general question for the group – – if one were to posit that the $CRX (Morgan Stanley Commodity Index) was going to head lower, how would one take advantage of that?

There are options on the CRX, but the spread between the bid/ask is something like forty dollars. And, no, I'm not making that up. So, errr, how about something a skosh more efficient?