The 86th Legislature enacted HB 1525 (codified at Texas Tax Code § 151.0242) to address the tax collection responsibilities of marketplace providers. It is effective Oct. 1, 2019.

A marketplace is a physical or electronic store, internet website, software application, or catalog that third-party sellers use to make sales. A marketplace provider is a person who owns or operates a marketplace and processes sales or payments for marketplace sellers (third-parties). Examples include Amazon, eBay, Walmart Marketplace, and Etsy.

The law requires marketplace providers to collect and remit state and local sales and use tax on all third-party sales. Marketplace sellers are not responsible for collecting and remitting sales and use tax on their sales through the marketplace, but they must retain records of the sales.

As of October first the state is now charging us sales tax on out of state purchases. I wasn't aware of this new requirement until I started getting charged a desperate fee for taxes on eBay purchases from vendors that are out of the state. I don't know if independent vendors will be charging the tax or not but eBay is.
Maybe everyone else already knew this,but I didn't.