While i'm not going to pretend to be an expert at japanese TF shopping, my recent experience didn't yield many GF sightings. In DenDen Town only one store i found had anything older than Movie or Classics 1 lines... mostly Superlink and Beast Wars; i only saw one GC-01 from GF.

The same store though had boxed Dai Atlus, Weirdwolf, Hun-grrr, Skullcruncher... a heap of TFCs (inc TFC-01, never saw the price though)... even a parts missing Trypticon for 3000Y.