Is there a list of Certificate Authorities that provides certificates valid also for digitally sign a document?

I have to digitally sign a pdf. I created a little app using the DSS library (an EU project, based on Bouncy Castle, very simple to use) that sign the PDF with PADES using a p12 file.

I know how to create a p12 file from a certificate using openssl. The problem is I only find Certificate Authorities that provides certificates for SSL.

There’s somewhere a list of official and trusted CAs that provides X.509 certificates also for signing documents? I’m interested in pricing in particular… 😛

Thank in advance.