So, you know I DID go to Round Top. Went through Marburger and Warrenton too. Honestly, if you are looking for it you would most likely find it somewhere on that stretch of road. There are permanent buildings open on most every week end. When I went, there were a lot of tents already set up and stocked. My interest was to stop at the Junk Gypsy
The store is pretty small and it is filled with manufactured goods. T-Shirts, Boots, jewelry, candles...all Junk Gypsy manufactured and all with "We are TV stars" prices. T-shirts (and we are not talking great quality either) were $35.00. You really had to want to advertise for the Junk Gypsys to shell out that much.
Now, in all honesty, I don't like to pay to advertise for anyone. Also, they ARE T.V. "stars" so I guess it goes with the territory. Just be forewarned, if you go expecting to see original/new/creative things you will be disappointed. I took pictures of the only sorta original items. Glad I made the stop though, because now I know.
All in all, a great trip and all the bluebonnets, Indian blankets, Indian paintbrush etc. made it a beautiful drive.