Hi Guys,
I took in everybodies input and contacted the suppliers you guys metioned and found some additional ones myslef. To give something back I will list the suppliers below and the prices they charge. Hope you will find this helpful:
Florachem - Citraflor OT3 - 25.96 USD p/gallon
Florachem - Citraflor R20 - 27.95 USD p/gallon
EzClean - D-limonene - 21.36 USD p/gallon
Envirox - ENVIROX H2ORANGE2 ONE RTU CLNR/ DEGREASER/SANITIZER - 16.27 USD p/gallon
Most of above solutions incorporate a form of d-limonene (citrus).