You have a few issues to deal with here.
1. You never get out of something what you put into it, even new in the box. Answer me this. Why would I pay full price from you when I can pay full price from the dealer and when a screw is missing go back to them and hold them accountable where I cant do that with you? You have to decide how much of a loss your willing to take.
2. Its been awhile, and certain parts may have changed, but last time I priced out a RamRunner kit by part from the OEM (No mopar doesnt make ANY lift, they rebrand) it came out to a little over $9K, lot of margin room for the dealer/MOPAR there.
So your left with a few options. Hold out for full price, their may be a sucker out there yet. Let it go for a reasonable price while recouping most of your cost, say $10k. Or build your dream truck and cut expenses elswhere. You may actually have better luck building the truck then selling as now someone is buying a turn-key rig, very attractive to those with fat wallets and skinny brains!
Either way, good luck and congrats on the little one!!!
Just Got it, Give me time!