Thats interesting about the pricing, in nov 2014 i was quoted over £400 each from lexus Glasgow and i paid £88 each from Amayama, plus postage and import tax.
BTW... From experience, use the parking brake more regularly, seriously, Lexus and my subsequent MOT guy both told me ages ago that the parking brake shoes tend to "bind on" as a result of the lack of/occasional use. Most of us stick in P to park up don't we, no parking brake ! ! Then, when the MOT guy tests the parking brake by stamping it on...it sticks, and fails the MOT...and makes for a real shock when £50 or so doesn't cover the mot this time ... was told this was pretty common with RX's ..maybe with other pedal operated parking brakes too !!!
The new cable and parts are pretty costly, if i remember its a kind of two piece Y arrangement.