They are free at namecheap when you buy a domain name.
I have a ssl on www.sharkyhosting.co.uk and some people seem to be haveing issues getting on the site and i dont now what is up idont manage my servers EUK Host do they installed the ssl and they said its working fine but people still have issues getting on them.
The certificate you are using is a EssentialSSL certificate, which is signed from the "COMODO Certification Authority". If memory serves me COMODO ca wasn't added in the ca "root" until sometime in 2006.
My guess is that it isn't yet in some browser's trusted root store yet. Mine included. Yet another thing added to my todo list...