Affiliate Marketing Secrets

I started a youtube channel a week ago, it is about makeup. I have already reached 250 subscribers. I noticed people with less subscribers (like 100-150) have been sent free products to review and giveaway. I have already signed up to be a sigma affiliate…and I tried to contact coastal scents, but got no response.
Do you know of any companies that would send me free products to review and maybe some extras for a 300 subscriber giveaway?
Thanks for the help!

http://www.amazon.com/Sigma-70-200mm-Ape…
I’ve been drooling over this lens for a while, and my dad said he’d buy it for me for birthday/Christmas.. but I don’t know.. My dads always tight on money and A. I don’t know if I want him spending that much for me even though he’s willing, B. I don’t want to get such an expensive lens only to be disappointed, and C. I don’t know if that lens is what I need to improve my photography, I don’t KNOW what I need to improve… I’m not sure what my photography niche is yet, but I think I want to get into photojournalism and I was told the F2.8 would help.
If you want to take a look at what I shoot to see how I could improve check out www.jdipierro.co.nr or www.jdipierro.deviantart.com (I put a lot more on Deviantart to get feedback, .co.nr is my portfolio for potential clients)