What is the cost of shipping a car from Canada to Texas?

Depend!

Cost of shipping car depend on your car weight, method to transport it and just keep in mind that you will need to pay for custom duties and any other related import taxes.

If you are in order to buy a car in Texas and send it to Canada, you definitely need transport company and brokering import agents to bring the car back, this will be complicated as the car will be inspected on the borders, you will take care several paperwork before the car allowed to pass the borders, anyway just visit links below for some requirements needed.

http://www.cbp.gov/xp/cgov/trade/basic_trade/export_docs/motor_vehicle.xml

http://www.riv.ca/importingavehicle.aspx

And it would be better idea if you just contact the shipper directly to determine the shipping cost, just give them call or visit their websites, get the quotes and instantly get the cost estimation, link below may helpful

http://www.a1autotransport.com/quote/quote.php