Do a search for "SSL Certificates" on Google and you will see a paid ad from GoDaddy for $12.99 SSL Certs. You can get one for 3rd party hosting. I have a dedicated server and that is what I use. If you don't go through that link then GoDaddy will normally charge $49.99.
It was still high price before 2 years for ssl certificates, one thing matters that ssl certificate should be from the trusted certification authority such as symantec, rapidssl, comodo, geotrust, thawte etc and with that, price also matters. I think re-sellers makes the way for that, they give heavy discount on the branded ssl certificates and we can get cheap ssl certificate from them. Recently i have found Cheap Comodo PositiveSSL at $3.19 from https://cheapsslsecurity.com/comodo/positivessl.html and still i was making comparison for the cheapest but i found this one as the cheapest ssl certificate and also i can trust on comodo.