The brake pads are not $8,000 in the U.S. They are about $2000 for the fronts and $1500 for the rears. I assume Tim's market just has some type of particularly punitive cost.
That is still a comically high price for brake pads. You have to understand though, the program is essentially unmoored and has been for a long time, with a long time to go. I would expect parts prices to remain high and get higher, with little rhyme or reason as to why one item may seem rational and a 6" long parts binnacle will cost $8,000.