I'd never heard of this usage, so I was surprised to see lots of examples show up on the Harvard dialect survey of US English:

http://hcs.harvard.edu/~golder/dialect/maps.php

See questions 54 to 57. The first two are rated as massively unacceptable (only about 5%), but the latter two have about a 20% or more acceptability. I'm not clear what the grammatical situation is that makes them different.

Traditional "some" is for positive statements, "I've got some", and "any" is for questions and negatives and suchlike, "Have you got any?" and "I haven't got any".

With "any more" I can make questions and negatives "Do you go there any more?" and "I don't go there any more" but there doesn't seem to be a positive: you have to say "I still go there", I suppose.