Yes this is still for sale. However, I aired it up today and there was a small leak through the macroline (however, it seals itself after the first shot), I've been talking to some people and it just needs a longer line, as the current one is a bit short. Price has been lowered by $10 in order to compensate for this until it's fixed.
I'm sorry, but a marker that retailed for $300 around two years ago, plus ~$150 in upgrades doesn't have a trade value of $400 to me. I appreciate your interest and wish you good luck selling, but you would need to be adding at least $200 for me to be interested.