There is an MG TF owners sales facebook page that has cars for sale on a very regular basis.
Also, the MG owners club website has what may be termed slightly more upmarket models and the MG Car club website.
Then there are various dealers out there, Trophy Cars etc that all have websites.
The benefit of the latter is they replace the head gasket, water pump and cambelt as a matter of form, however with a good service history buying privately can be good value.
Lots of choice depending on your budget and as a newcomer to the marque I can say they are great reliable fun, when the generic and well publicised potential issues are sorted.
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