My friend with ADHD just haggles his 36mg concerta's. I'm assuming they aren't anymore than 2-3$ bucks each a pop. He made about $45 bucks for 15 of em. But then one time sold 15 for $30. They are whatever really, but some people consider them a mild-strong coke high, and when you are in a normal mindset searching for any psychological symptom as a high, concerta will probably do just that anyway.
Q1. Alza is the manufacturer.
Q2. Probably wearing you out, they are just a short acting stimulant afterall.
Q3. No, it is a scheduled subtance, a high ranking one too. I believe Schedule II
Q4. $2-$3 (even for his 36mg.. so 54mg might pose you more luck/$$$ if you brag on that fact.. 54mg is the highest dose you can get of the Concerta label, which in turn is just generic ritalin I believe)... Like I said is what my friend sells them for.. No clue if it's the general street value, but I'm guessing that would be cheaper than what is regular, as he's just trying to make a fast buck for pot, not deal off his scrips.
^ is your drug. Read up.