I would be interested in seeing some of your pages as you create them and get a better understanding of your vision...for example, when you create a page how do you determine how much space to reserve for stamps (all major Scott numbers within that time frame? just the ones you own? some subset you defined?). I print Steiner pages complete to certain dates.
As for getting stamps. Do you have a certain criteria you are seeking (i.e. pre-1940, more recent, certain countries, etc.?)
I have seen the following sources:
"Shoe box" lots - very low cost per stamp but usually the most common issues
Kiloware/on-paper - often country specific and recent - you don't seem to want on-paper. I like these for certain countries where I collect modern stamps.
ebay also has collectors selling doubles scanned from stock pages at around 5-10cent each on average.
Stamp stores like Subway that sell X-many different per country.
ebay for collections in stock books, on pages, in glassines, etc.
Stamp shows - I bought a collection on MInkus pages of just western Europe in an auction at the local show that has been a good jumpsart and complement to my albums for those countries.
I am starting to believe that I want to make bigger, more expensive, but fewer buys vs. a lot of small buys in pursuit of getting a few more gems and still keep the average price over time affordable. THis can be supplemented with some recent issues buys on paper or off....Japan for example keeps me busy...lot's of recent kiloware and off paper at affordable prices, but my main interest is buying collections focused on pre-1940...or at least pre-1960...usually with a volume focus on certain countries to get a great start on a particular album vs. diluting my buy across 30+ albums. I'm selling dupes, and extras trying to build some funds...I also sold off some portions such as post 1940 eastern europe, independent Africa and my Latin American collection to raise funds to improve my coverage in areas of greater interest.
I'm still learning, however, so I'm interested in what others have to say as well!