Jim,
Chris just picked up some GE 55w PC tubes from Commercial Lighting. A 6 pack was $130.32, or $21.72 per tube, a much better price than any lfs
Don't know if they can get you the bulb you want, but we have special ordered all kinds of lighting from them over the years.
5919 - 98 Street
468-0999
Chris always does the ordering. It seems they will order stuff if you go in person and have a part number. For instance, the tubes we ordered were GE F55BX/AR/FS.
Commercial Lighting also has stores in Winnipeg, Calgary, Victoria, with head office in Delta BC.