Triggers and Locks are seldom "unsalvageable" and individual components for the lock are available.
It's the condition of the bore that drives the price.
And barrels are available too.
Your getting close to a reasonable price for a used TC with a bad bore @ 100-150.
tip: Check to see if it's loaded by using the ramrod, just slide it down till it stops, mark the top of the barrel with your thumb on the rod then hold the rod outside the barrel,
You can go to a local sporting goods or bait shop and get a small lighted bobber "light" for $3-4,,
these little things can be turned on with a twist and dropped down a bore to see bore condition.
I like the green color.
This can be used to barter the cost, if the owner see's the bad bore like you do there's haggle room.