http://www.drivetrain.com/parts_catalog/ring_and_pinions/chrysler_8.25_ring_and_pinion_sets.html
I beleive this is the same trac loc DTS75101X but under the Dana brand for $245.80 It does say prices on website may not be up to date, but they also offer $10 off for registering on their facebook page so it's not 10 years old or something LOL!
and here for $284.77 with free shipping
http://4wheelonline.com/Trac_Lock_Traction_Differentials_.241.1855
Can you tell I've been looking for one as well?