If the item you want has a “make offer” option, make an offer. There isn’t anyone specific to discuss it with. You will get an email of acceptance, or counter. You can haggle from there. Of course, there will be a bit of a premium if buying through them. They handle all the incoming shipping from any item, trade or otherwise and pay to put ads on EBay, Agon, etc. it all costs money…
Overall, I’ve had great success with them and think the new policy is very reasonable.