A new service is in beta called Coinflash. The service provides a unique way to save cryptocurrencies. The service looks at your credit card purchases and rounds your account to the nearest dollar. Then you can allocate a monthly or weekly purchase into your Coinbase currency of choice.
While I am always cautious about any new financial service, or any new service to me that touches my finances this service looks promising if you forget to invest, but have a good sized wallet.