So starting to get the foggy lens. I sanded and buffed but seems getting fogging on the interior of the assembly so I stopped sanding and buffing. Now I am anxious about having removed the protective coating and thinned the plastic. Going to have them done professionally (they said they can clean the interior and apply a coating that will need to be redone in 2 to3 years).

I am seriously considering just replacing them. Seems replacements are like $1300 to $1400 for a pair of factory. Anyone know of another option for new? As our vehicles age like all of us I get concerned about parts.

 

The only other option is a scrap yard, there are no aftermarket units.

 

yes, another method is using a reconditioning kit then spray headlights with exterior clear coat spray.

 

Anyone else get fogging inside the lens?

 

Yes, I have fogging inside my lenses. Threads about this problem suggest removing the light assembly and cleaning with methanol. The fix is to pour some liquid methanol inside, slosh it around, dump it, and air dry. The fogging inside is cause by trapped moisture due to air vents not working properly. My lenses are fogged on the inside with a film of mildew which is probably your problem as well. I am going to try the methanol or some other solvent approach which requires removing the light assemblies. This requires doing some disassembly work.
There's also a Youtube that shows another method using a cloth inserted on the inside of the lens and moved around with a magnet.
Proper buffing and sealing of the outside surface will not destroy the lens. Buffing only takes off microns of material.