The easiest method to lose weight would have to be by surgery. It's not ideal but it's the easiest and fastest way to lose weight.
You could have a gastric bypass which is a surgery that essentially reduces the size of your stomach and in turn reduces the amount of food you can eat. This will make you fill full faster and you'll end up losing weight without actually doing much.
You could also go in for liposuction which is the removal of fat from certain parts of the body and as is probably the fastest way to lose weight because the effects are immediate. You'd literally shed a couple of pounds over night.
But if you don't have the money to pay for all this then your best option will be to take the long road and exercise and diet. This is probably the most sustainable means of losing weight and it's the cheapest means as well.