I have an account at coinbase,
If you simply need to lock in the price today, purchasing through Coinbase lets you do that. The coins are delivered when the ACH transaction completes after a few business days.
Dwolla works well if you already have funds sitting at Dwolla. If you need to draw funds from your bank account, that process will take a few days.
Cash can be deposited at Chase bank and the funds applied to your BitMe.com exchange account. The only problem is there isn't always sufficient liquidity. At this particular moment there is an ask order at about the same level as at Mt. Gox.
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http://www.BitMe.com