DSF

the cheap ones are ok but very basic
the middle of the range option is the best value.
and i also sell ssl's to sites not hosted on my server
prices start from £25
http://www.christianhosting.org.uk/ssl.html

having had our store up and going for about 3 months now - we find the security from paypals secure payments more than enough.
Not one of our customers have complained about non SSL compliance. - we thought about it at the beginning but decided against it....not saying we will not do it at a later date though....

I dont have one on my website, because the shop part (ecwid) as its own so is not needed, must admit i only checked when i see the post come up yesterday.

the shop part (ecwid)

How are you finding Ecwid?

I have only used Ecwid as a shop so cant compare with any other i'm able to add this that and the other very easy, i try to stay clear of touching the machine code bits.

You might want to also take a look here.... http://www.namecheap.com/ssl-certificates.aspx