I do not do Giveaways in particular, but I do write reviews for sponsor related products. If you are interested, you can click on this link. All you have to do is sign up and have a pay pal account. They will email you leads and if YOU are interested, you can write about the product and get paid for it. If your starting out the amount can be a small as 6.00 bucks per post. If your interested, please use my refferl link.
One way is to start doing reviews and asking if the company would like to donate an extra item for a giveaway prize. Most of them will be more than happy to. I'm also occasionally contacted by service-type sites that offer to donate a giveaway prize in exchange for sharing information about their site/event with my readers.
Aloha - Kailani