Trust me, they are dwindling. You used to be able to buy knuckles and spindles from vendors cheap. Not anymore. Everyone and their mom welds some crap on the axles, or wheels them not setupo right, or like an idiot, and bends them. Then you have the guys that buy up the junkyards supply. Every yard up here has at least half their toyotas off limits becuase they have already beenbought and sold to buyers in cental and south america. If you were in the toyota parts and sales business you would know this. This is why people are doing core business. The demand isnt here in the US. it is everywhere else.
Id be willing to bet that the amount of stock solid axle trucks in USA let alone california, has dropped 1/3rd in the last 5 years.