I don't know how long this will last, but it would appear that the various import offerings(copies) of the RPM heads for Mopars has made someone get a little more aggressive in the pricing dept.

The new Jan/Feb 2017 catalog vs the Nov/Dec 2016 catalog has both the BB and LA heads priced several hundred dollars lower in the new catalog.

60929 BB head, $1708.98 in 2016, now $1462.00

5090 BB head, $1499.47 in 2016, now $1089.64
5093 BB head, $1689.50 in 2016, now $1089.64

60779 SB head, $1699.00 in 2016, now $1366.84
60179 SB head, $1771.70 in 2016, now $1382.34

I think the price/quality of TF heads must have also had an impact on the BB RPM sales, and there just wasnt enough price difference between the two.
I was more expecting to see the TF heads prices go up instead of the E head prices going down.