Apparently it's easy to get here if you are with a tour. We weren't. It took us a couple of DAYS (not all day, we tried for an hour and gave up, tried the next day) to find this factory. Finally we took a wrong turn and there it was. They have great stuff and every place you go for dinner has their glasses and plates. It isn't cheap. But for a tip, the guy will let you hold the pole with the crazy, hot glass and make you feel like an artist for a bit.
A nice drive for lunch to Todos Santos is a relaxing way to get out of the city. There is not much here in the way of entertainment. The Hotel California is a great place for lunch. Watch out for TOPAS (speed bumps in the middle of the highway)!
Just outside of Cabo are several glass factories. We really like the smaller family run factory and try to support them by buying several pieces each year. The tour busses all go to the bigger factory.
There's one of those Mexican glass factories on the north (inland side) of the highway between San Jose del Cabo and Cabo San Lucas. Prices are good, especially when you check the same items in the import market back home. Alaska Air supplied two good carry-on boxes for the trip home - worked well.