Thank you so much for your detailed comments and your information on the Alpha smart drugs. I'll do my best to answer your concerns and give you some info.
First of all let me say that habit forming is definitely the best way to go; before Modafinil this was my main weapon. However I found that it didn't help me when I was a few hours into a task, sometimes less, I just wanted to drift off and do something else.
This is the main thing Modafinil helps with; although you still need your self-motivation to start the task.
For instance; if I take Modafinil and then start messing about on Facebook, I can look up at the clock and see that I've wasted 3-4 hours doing nothing.
Modafinil is originally a narcolepsy drug, so I've never taken it after 4 p.m. and that is super late. Usually I take between 5.30-9.00 a.m. and the effects last around 12-14 hours.
Like I said, I've taken it as late as four in the arvo, however this was after fairly prolonged use, and I definitely wouldn't recommend a new user taking some any less than 12 hours before bedtime.
As far as price, expect to pay between $0.89-$1.20 per pill, depending on the quantity and of course where you get it from. Most places do some kind of discount if you pay with Bitcoin and sometimes Litecoin.
Okay as far as sources are concerned, I use Modup.net, I find they are best if you order at the beginning of the week, ordering on a Thu/Fri seems to spin out their delivery service.
I usually use the 7 day rush and pay with Bitcoin, though I'm looking for someone a bit more reliable when it comes to delivery times.
I was recently recommended another couple of sites which I gave a cursory check; however I can't remember them now and can't find the post. I will find it and get back to you.
Cheers
Cg