$50 Off at Ring.com

Does Ring have a business presence in Texas? I ask because the online ordering system wants to charge me $20.54 for sales tax on a Ring Pro.

ETA: Also, using the GIVERING promo code correctly applies the $50 discount, but the site is calculating the aforementioned sales tax based on the regular price of $249. Total sales tax in my area is 8.25%, so it should only be charging $16.42, not $20.54.