Information/Pricing on Martin Logan Speakers

Hi everyone, I'm a newbie here.

I'm hoping someone could get me some information on the going rate for some Martin Logan speakers. Here's what I've been given and now need to price out to sell at a reasonable, but very good price. I've got the following:

2x Martin Logan Ascent i
1x Martin Logan Cinema Center
1x Martin Logan Grotto Sub

Any help is appreciated. Thanks!