No. It's not for sale (unfortunately).
By completing missions mostly
There are no Cheats in GTA to do it .You can download only search for mods in google .if you get,good for you.
Grand Theft Auto 5 is currently £39.99 on Steam, though is frequently on sale.
Look on Auto trader on the internet and you will probably find a picture of one for sale somewhere.
You can find Austin Healeys for sale at Auto Traders, Cars Direct, Hemmings, Austin Healey Club, Old Ride,Auto Farm, Auto Classics and Bramclass Auto.
A private auto sale is considered a contract. As such, if the buyer isn't paying as agreed, he's in breach of ths contract and subject to civil remedy, such as a law suit. Unless specified in the contract or allowed by your local law, you can't take the property back. That places you in breach as well and could be considered auto theft.
There are a few Canadian auto dealers that have used Jeeps for sale. Some of the those dealers include 'Riverside Auto Sales' in Ontario and the 'Canadian Auto Mall' also in Ontario.
One can find a Porsche 928 for sale from the following places: Car for Sale, eBay, Piston Heads, Car Sales, Auto Trader, AOL Auto, Auto trader Classics, Car and Classic, to name a few.
There are a number of websites where one can find an Audi S8 for sale. One can find them for sale at Auto Trader, Car Gurus, AOL Auto's and ebay Motors.
Information about Rovers for sale can be found on Rover Car Club of Canada, Monster Auto, Auto Catch, Car and Classic, Land Rovers 4 Sale and Rover Club.
There are many places once can find a Hummer H1 for sale depending on your location. Your local auto dealer may have one or you can try searching auto trading websites such as Auto Trader.