Not true, I just threw together a BCM upper on a palmetto state lower for under $1500. Just be patient and do not over pay for stupid shite. A DPMS is not worth $1800 ever, not in this climate or the end of the world. Daniel Defense just had a rifle selling for $1800, that is worth every penny. Wait on deals (basically retail now), they are there just more scarce. Some places are not price gouging (BCM, Palmetto State, Daniel Defense, Rainier Arms) so stick around those sites for what you need.
Here is exactly what I did 2 pages back
BCM Upper $120, BCM BCG $180, Upper kit $30, PSA LPK minus trigger (with buffer tube, spring and buffer) $90, Lower $70 (these are the only things hard to find for a build), ALG ACT trigger $65, BCM charging handle $45, BCM grip $30, Mag-pul ACS-l $100 and BCM 11.5" barrel $300.
All I need are some handguards and some iron sights, maybe an Aimpoint and I am done, all of these except the lower were purchased after the 1st of this year.