let's see my paper is fairly cheap. i draw on letter size cardstock that you buy for a ream or so at $5. i use a kohinoor eraser. and that thing eats thru erasers. 3 boxes a year. those things arent cheap. i draw on also on a kohinoor drawing board which i have to replace every three years because the cat likes to hop on top of it when i'm drawing on it. drawing boards are not made to support cats. at least the cat ignores laptops- thank goodness. i reduce the artwork to digest size and print it out on nice white laser paper that gets mounted on the cardstock.
and then i start using tones. that's where the expense comes in. tones can be 2-4 dollars a sheet depending on the size. i also make my own too by running an applique film with repositionable adhesive thru my laser printer. that's whole lot cheaper than buying tones. if i but the film in bulk, which i do. however, it doesnt give you good dot tones, so those i still have to buy. and the films harder to cut too. and they always come out with some new tone that i just have to have. anyway i've probably spent around $250 a year for tones.
as for the ink stuff i use my faithful .35 rotring pen. which i end up destroying every 5 years because i'm a paper gouger. and ultrafine sharpies which i buy in bulk at the office store. i use micron sparingly as they break so easily. tho, i love the micron brushes . and the sakura pentouch.7mm white pens are great for detailed white linework. though they will bleed if you're not careful. still well worth the trouble of not having to drag out white paint and brushes..
so most of my stuff is either bought at ofice warehouses- cheap
or at art tech type places- expensive
or online- argh that shipping 
. so my art supplies probably cost me around $400 a year.is it worth it. of course. i guess i could dress nicer with $400. but i wouldnt be having as much fun as i do when i'm drawing my stuff
