I gotta pipe in here and say that I've been toying with different cabs, older model Diezels, some Mesa, some Soldano, some Marshies, some "no name high quality birch" empty cabs, yada yada yada. I blew some coin on all of it - buying it, trying it, trading it, speakers, time, more time, speakers, etc. Ya, I found some decent combinations that still work (but mostly in the 1x12 and 2x12 context - Jensen speakers, Celestion Gold, etc). But with the search for a 4x12......commercial or not - I ended up just having to pull the trigger today on a brand new 4x12 FLG12K Diezel. It had to be done. Best amp in the world deserves the best sounding cabinet in the world.
Now, there's been awesome feedback here - craigslist, eBay, etc. - hell, some peeps on the net make just empty high quality cabinets that you load and wire yourself. If you consider speakers today for a Herbie, you're looking at a rating of say 50W and more for a 4x12 to handle Herb's power. Some speakers really match well - like the G12K100's - they cost ballpark $125/each. so let's say $100 each best buy. Right there is $400 in cones alone. And G12K's aren't even expensive. So...are you going to find an empty shell cabinet for $100...?? Maybe not. And the clincher here is - if you DO find a $500 cabinet - WHY is it SO cheap? Someone's getting rid of it for a reason most likely. Cuz even cabinets that are beat to shit - if they still sound good and people know this and they're sought after - they ain't selling for $500.
Hope this makes a bit of sense. Money can always be made...just don't get too deep into the things you own, ending up owning you.
Peace,
V.