[bencxr]

you could also "make change" by exchanging ownership of the $100 address for 5 $20 addresses, and change those down into 10 $2 addresses each. there's very little cost of executing this algorithm several times over for a "single" purchase.

[the_decider]

There are problems possessing 10 $2 bitcoins, due to the minimal transaction fee (approximately $.20). Reclaiming the value (putting back On-Blockchain) of $20 worth of $2 dollar addresses will cost you 10%. Then again, %10 is how much Coinstar charges to turn loose change back into dollars. Still, a better alternative is this; replace Bitcoin with a lower-denomination Altcoin (Dogecoin?) to cover preset currency addresses below a certain amount. Dogecoin's transaction fee is negligible, so the reclaiming cost is no longer an issue. Though Dogecoin's fluctuations demand some level of, the lower-denomination restriction makes these fluctuations negligible (By which I mean this; A quarter is more likely to fall out of your pocket than a $10 dollar bill out of your wallet. However, the quarter's ease of use is more important than its potential loss of value, which is relatively negligible when compared to the $10 bill)