In the Denver metro area of Colorado $1.51 seems to be a pretty standard price for diesel, regardless of what company you buy from. I have seen as low as $1.35, but the station was poorly maintained and I was hesitant to put their fuel into my Benz.

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Ben

The MBs:
1976 300D (W115) - 330K and still going (sort of)
1991 300D 2.5 Turbo - Sold at 221K
1983 280SEL - Sold at 206K
1981 300SD - Sold at 232K