Or are they typically reliable, in anyone's experiences or opinions? Their prices seem cheaper, but not so cheap that it is cause for alarm I think.

Here is their Amazon items: http://www.amazon.com/s/ref=sr_pg_1?rh=n%3A4991425011%2Cn%3A%214991426011%2Cn%3A5088769011%2Cp_4%3ATopPix+Autographs&ie=UTF8&qid=1401903660 They say: Certified Authentic with a Certificate of Authenticity Lifetime Guarantee of Authenticity COA from TopPix Autograp...