Well i want to start reviewing iphone cases but i don't really want to spend all that money on a bunch of cases. I have heard of people getting them for free from some companies...Any suggestions?

Basically.........this is not going to be an easy task.

The only way a company is going to send any individual anything for free is if they believe they will get reimbursed by:
1. Advertisement (potential customers actually viewing your video)
2. Increased Profit (potential customers will tell others by word of mouth)

Either way you will more than likely have to pay for the first 20 or so products you review (to establish credibility).

Once you get started though, the sky is the limit.

Try getting articles published in small magazines. After that go for more established magazines.

Also, DOCUMENT EVERYTHING! Remember, you are also creating a portfolio.

The portfolio is what you are going to submit to the different companies when you want something for free.

GOOD LUCK!