Hi Lankeela.
Money saving suggestion number 1:
Don't take the car! You'll probably find it much cheaper to use the train. (From central London, don't use Gatwick Express from Victoria. Instead take the First Capital Connect service from London Bridge; it's far cheaper).
Money saving suggestion number 2:
If you need to stay at a hotel overnight, to catch an early morning flight, look for one which offers on-site car parking while you're away (with a shuttle service to and from the airport). That can work out far cheaper than paying for your hotel and parking separately.
Money saving suggestion number 3:
Use a dedicated price comparison website
http://www.gosimply.c...king/gatwick-airport/
but then, when you've found a possible company to book with, google 'review xxxx' (where xxxx is the name of the company) to find out what others think of their service.
Chris