Fresh mushrooms aren't the cheapest things on the block, especially if you go for the wild varieties. However, dried mushrooms are even pricier. If the price tag on the dried fungus has ever turned you off, dry your own!
The big key to this process is dryness. You don't want your mushrooms to be wet, and you don't want the air to be humid. Both are just begging for a moldy mess, rather than dried 'shrooms. Furthermore, if you don't let them dry out enough, you'll still get a moldy mess once you store them.
The simplest method for drying is stringing the mushrooms together through their stems with thread, and hanging them upside down in a warm, dry room for a handful of days to a week. (Many shroom-driers hang theirs in windows to dry them in the sun.) This technique also works with drying racks -- place sliced or whole mushrooms on a rack in the sun until sufficiently dried.
For other methods, check here.
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