Detailed recycling is a pain, but bike shops can and should save clean aluminum (free of mixed metals) chunks like crank arms. These are easy enough to save, take up little room and over the span of a year can add up to a nice bit of change. The rest can be given to a mixed metals recycler who won't pay, but will teke away free or a for a small charge.

An alternative way to recycle is to call the boy scouts. Many troops have active metal recycling programs they use to raise money.