Lisa,
Disney does not, to my knowledge, post the pricing for the different Disney dining plans.
However, I did do a little bit of research for you. It seem that the Deluxe plan typically works out to about $72 per day, per adult. The standard plan, in contrast, comes out to about $42 per day, per adult. So about $30 per day, per adult difference.
I think both are good deals, if you use them wisely.
Feel free to send me any follow-up questions, especially the dining ones!
Have a magical vacation!