There are many ways around buying and installing a traditional whiteboard, but they require a real commitment of time and space. Whiteyboard is a stick-on whiteboard you can apply anywhere you need to write, starting at $US10.
Whiteyboard was started by Jason Wilk, a principal with venture capital firm Y Combinator, after he discovered how much a whiteboard cost at an office supply store. Determined to give small startups an alternative, he came upon the idea of stick-on whiteboards. You can order them in three sizes, starting at 12 by 18 inches for $US10 and ranging up to four by six feet for $US30, and they can be cut to fit whatever size and shape needs you have. Helpful stuff for those with great ideas, but not $US300 and an afternoon to spend buying and installing the sketch space for them.