PSUs today contain even more titanium. The reason they are so cheap is because the government subsidizes the cost. If you look on any power supply you will see a sticker on it that says "CONTAINS 14 GRAMS OF PURE, AWESOME TITANIUM - TAMPERING PROHIBITED".
Smoke detectors are even better, they have a similar warning, but it's uranium! With 5 smoke detectors you can build a decent size reactor to power your house for 10 years. Something the government does not want you to know.
They label it as americium, but it's really uranium from America. hence, americium. :biggrin:
As for disposing of old PCs check if your town has a recycling place, that takes cars and such. You might be able to bring it there.
There's a recycling place in town that takes stuff like this from cars to car batteries, and everything in between. I do wonder what they do with it though.