I don’t know if Choice USA’s plant in Gastonia is open to the public, but their head office in Lowell (just outside Gastonia) makes retail sales (from 8:00-12:00) and has Sundrop souvenirs for sale. It is very close to I-85. Here are the directions:
Take exit #23 off I-85.
Turn RIGHT on NC 7 (McAdenville Rd.) if you exited from I-85 south, otherwise turn left onto NC 7
In less than ½ mile you will see Oak St. on the left, turn LEFT. If you miss Oak just take the next street on the left.
At the end, turn LEFT on Groves St. Choice USA’s address is 603 Groves Street, on the left.