Are the other manufacturers of solid lash adjusters? I was checking out the ones at airram but they are a bit spendy.
They aren't the manufacturer, but they are the least expensive of the two sites that stock them.
I don't know if you can buy directly from the mfr, but they are:
And their price sheet
lists the "SLC DG00212" at $299.95.
Airram lists them for $5 less.
3rdstrikeperformance.com lists them for $439.95--$140 more!
Youtube channel MartinBuilt has a video or two showing how to install them.
IMO solid lash adjusters are a must for the 3.7/4.7 engines--any failure to lubricate a hydraulic lash adjuster or any other sort of adjuster failure can grenade the entire motor. All it takes is throwing one rocker arm--and plenty of reports of that happening. The solid adjusters should make that impossible.