You can set a limit order on your favorite exchange. It will sit there and sell them off for the price you specify as people are willing to buy them. Of course, if anyone is selling them cheaper than you, yours won't sell until theirs are gone.

Alternatively you can just place a market order a few times per day for a week. It's more work, but we're really only talking about ~1 minute of work per $200k or so. MtGox handles more than $10M in Bitcoin sales per day and they represent a minority of all exchange volume.