Don't know if any of these are close to you, apparently there are no distributors in RI....but these are all the next closest places that sell by the case for ~$22/gallon. Give the closest one a call...
L F Powers Co Inc
40 South 5th Street
Waterbury, CT 06720 203-753-5555
Alliance Energy Corporation
30 Charles
Needham, MA 02494 781-444-4472
Altman Distributing Co.
11 Old Right Rd Unit B
Ipswich, MA 01938 978-356-4369
Lub-O-Line Co
9 Florence Street
Somerville, MA 02145 617-776-4490
O'Connell Oil Assoc Inc
545 Merrill Rd
Pittsfield, MA 01201 413-584-4168
Schultz Lubricants, Inc.
164 Shrewsbury Street
West Boylston, MA 01583 508-835-4446
Good luck!