Extreme Motorsports on 66th (north of park blvd) has 76 race gas (not sure of the octane levels, but I believe they have 116). Also, the same shop that sells it @ Sunshine(their name is escaping me at the moment) has their own shop on 66th (south of park blvd. next to sherman williams store) and I believe carries 116 if not 114. I think they carry Sunoco, but not positive.
I just wish someone would start carrying VP....