Using e-commerce logos to get better conversion rates

I have read that using different e-commece logos like BBB online, TRUST E ,SSL CERTIFICATE and Hacker safe can give you a better conversion rate.

Have you experienced this? How much do I pay for them or are they free?

You can find them for free all over the net. Or you can pay a designer to make them for you. Personally I like individual looking designs that look proffesional as well as real. So I say get a designer to create some for you. Just make sure that because you paid for them you don't go sticking them all 'happy slappy' over your page. keep it proffesional and you will find much better conversion rates.