To the best of my knowledge GT was never sold in big box stores. In 2001 they went bankrupt and were bought by pacific cycles (who also owned mongoose) but still remained a bikeshop brand (Schwinn and Mongoose were both sold in big box stores). Generally GT was also more expensive brand, on the cheaper end would have been Dyno but I can't think of anything that cheap for a freestyle bike
I would do a search through catalogs by year to see if you can find anything