I don't know what TSOHost offer in terms of different SSL options and pricing but I can guarantee you'll be hard-pressed to find cheaper than Namecheap.
https://www.namecheap.com/security/ssl-certificates.aspx
Realistically you don't need a premium SSL certificate (i.e. EV or above) unless you are serious about commercial use. Small e-stores will get away with just DV.
Most hosting providers based on WHM (cPanel) will very likely issue you a DV SSL for free as it's quite literally a couple of clicks for them now. I think with a recent update the customer can do it from the cPanel update too but I've not yet explored that feature.