In my experience, "call for quote" type places are way more expensive than $5.99/month type of things. It's usually for the plans that for more than 2,000/perX that get those. At that point, it is definitely a negotiation. These places feel like just because your website receives X hits per hour/day/week translates to you being able to pay for a higher rate to do something like license a font/image/music.

The places that are using 'call for quote' on things available on Walmart tend to be people that don't want people of Walmart listed as a customer. However, again, in my experience, I haven't seen one of these. It's been for things that are going to have sticker shock level pricing.