There is no way to receive SMS messages other then via SMS
You can usually send SMS messages via the email to sms gateways most providers have.
I agree with the others - if you're using SMS and the per-message charge is regularly over the bulk rate, just get a bulk rate plan. For example, Sprint has 500 for $5, or 10 cents each, which is 5 cents cheaper then the 15 cents a pop per-message rate. As long as you get & send more then 333/mo you'll save money with the bulk package. Less then that, it's cheaper to just pay as you go.
With the amount you are spending, you could just ask to see if they will give you a small bucket for free or a reduced rate.
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