Being a Texas resident and buying online from a Texas dealer, I paid the Texas sales tax (8%) & shipping at the time of ordering.
Will pay my FFL their $25 fee when I pick it up.

Incidentally, I placed the order at Grabagun (in Coppell - near Dallas) Saturday afternoon. They sent the package to the pickup place at 5pm last night (Monday), it was at the Irving FedEx center an hour later, left Irving on a truck at 11:20pm, arrived in Austin this morning (Tuesday) at 4:54am - the driver must've stopped for a long breakfast in Hillsboro - and left the Austin FedEx center on a truck at 5:01am for delivery in north Austin.

Pretty prompt service.

Now we'll see how long it takes to get to the FFL dealer, since Austin just got freezing precipitation overnight - there is ice all over the driveways & streets in my neighborhood - then how long it takes for said FFL dealer takes to check it in and notify me for pick up.