For just practicing drawing, I've enjoyed using the big newsprint pads, and either soft lead pencils or graphite sticks, and those thick leaded, wax-based pencils that you peel the paper strips off as needed, instead of sharpen, forgot what those are called...
No erasers in practice, you just turn the page and draw again, if it isn't turning out the way you like it.
I also have used printer paper, since I have so much of it. That way if a sketch comes out well, I can scan it.
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"Not everything that steps out of line, and thus 'abnormal', must necessarily be 'inferior'. " -- Hans Asperger (1938)