Mine cost about $300 US to have installed, but it was less than two feet from the panel. This was in addition to the EVSE, of course.
You may want to ask how much for a 6-50 outlet alone and then get an EVSE with a plug on it instead of hardwired. I've found that once you mention "electric car charger install" the price goes through the roof as opposed to just asking for a new outlet.