Stock Junk? I cannot imagine a scenario that would involve breaking the stock shafts (which are, by all standards, oversized) but still allowing the use of a relatively weak housing. Out of the entire drivetrain (motor, transmission, transfer case, driveline, rear differential, axle shafts), the axle shafts are the absolute last thing I would consider in need of an upgrade.
If your truck is so heavily modified that the axle shafts are the last remaining weak link, then more power to you, but I would think that you would have found an aftermarket manufacturer that could do this sort of work without asking on Y!A and putting down the one person that tried to help (note that you did not state you wanted aftermarket originally - in fact you mentioned not wanting to pay Toyota list price for the stock piece).
So, all that said, you're not going to find a cheap source of aftermarket shafts for an axle that (virtually) nobody ever upgrades. Poly Performance *might* have what you need. Otherwise, I'd just find a competent machine shop and have them made custom.
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