Maybe readily available given the contacts and money that Jack Osbourne has, but with the exception of weed, the rest of that list isn't all that easy to get ahold of for the average person. Maybe if Jack wasn't hanging around the MTV set (both location and people), he'd find it a lot harder.
No kidding. Is everyone missing the chronology of Jack's problem? It only developed seriously when the MTV show came on the air. Given the new found fame and a gaggle of sycophants at his beck and call, he could get anything he wanted. Jack Osbourne is hardly your typical 17 year old doper.