BTW, what do most people do for license plates for the ride home when buying out of state?
Nuttin. You have something like 30 to 45 days to get your plates. Just have your bill of sale (copy) and proof of insurance with you. Then don't do anything to get pulled over. If you do get stopped and they ask, show them that paperwork and you'll be golden.
While this might be true for Texas, it's 100% wrong for Florida. If you disagree, I'll let you pay the $125 ticket I got for driving home a used pickup truck I bought without having a tag on it. And since I purchased it from a private party, I didn't have a temp. tag option. In Florida, at least, having the bill of sale in your possession without having proper registration means exactly dick.
The dealer is required to provide you with tag and registration at the time of purchase and the purchaser would at the very least receive a 15 day temporary tag, which gives the purchaser plenty of time to get the vehicle home and registered in the state of residence. If one was to purchase from a private party, as in my case, it is the purchaser's responsibilty to take the bill of sale to the DMV and acquire tag and registration BEFORE putting the vehicle on the road.