If you are asking Comcast to tell you the price of the components of a service bundle, they say that figuring out those amounts is not their job, it's up to you. See https://www.xfinity.com/support/articles/employer-reimbursement for their policy and an example that may help.
If your services are not bundled, those prices should be listed on your Comcast bill, available online when you log in to https://customer.xfinity.com/#/billing.
Be careful what you wish for. I did that yesterday, and after first saying there was no way to do that, the Xfinity tech managed to find one because I demanded to know why he couldn't.Then asked to cancel movie services we never watch. The tech clicked a few buttons and they were gone, and he wrote out that our bill would drop from $254 to $222 per month. Great...or so we thought. The only problem is that the button-pushing knocked out our internet and phone (we bundle) and knocked our bill up to $286 per month! They now expect us to pay for extra charges for Internet and phone that we previously had in our service package. The tech never said a word about any extra charges, and never mentioned a single word about the Internet or phone. Xfinity is such a rip-off! As soon as we can get with someone else, we're cancelling them and ending the nightmare. We're sicking of Xfinity's money-grubbing greed.