Stephen, There are a few 900 systems left here. and some (or a) 900 LTR system. Com/Net Communications Own and operate a 900-LTR system with the new line of Maxon radio's on it. its supposed to have coverage (or sites) in Dallas, Ft. Worth, Mckinney and Howe.
Another 900 system is Motorola-II based off the Bank One tower, I can't remember who owns it. Might be Com-Tex or Megahertz. it has some towing and plumbers and other service oriented business on it, maybe even a Security Company or two also.
On Com/Net's 900-LTR First Watch Security have like 4 Talk Groups and wide area coverage. I think Super Shuttle has a few ID too.