[Blind-sysadmins] PCI DSS validation

Hi Listers, I am looking for a PCI DSS validation and scanning service somewhat accessible. We have previously used, Trustwave to scan our networks and found out that the service is horrible, all based on flash, won't work with NVDA, won't work with JAWS, just totally inaccessible. I don't even know yet if our merchant will allow us to use different provider for PCI DSS validation. I am looking for alternatives. We are SMB so some of the enterprise providers might not be well suited or affordable for us. I apologize if this is something not sys admin related, I do have to manage it. Any suggestions or experiences are welcome. Anatoliy