Wal-mart carries Mobil 1 15W-50 (not the extended performance line) for @ $25/gallon.
http://www.mobiloil.com/USA-English/...1_15W-50_.aspx
Not the same as the old extended performance line, but should be close.
http://www.mobiloil.com/USA-English/...AQs.aspx#FAQs3
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