I just weighed a CD in a jewel case - appropriately, "An English Mass" by the Anonymous 4 - it was 3.5 oz. [99.3grams] so I'd guess you are looking at 8 oz to ship.
Assuming 8 oz. [~227g, pardon my bad conversions from memory] a letter is $6.40. I think that 3+ pounds.
Parcel post is $16 for a pound of weight. These are
US POSTAL SERVICE_yeah sure:
United Parcel Service is
Here I couldn't figure the rate without a postal code so you'll have to do your own.
The 34488 is Trimoon's US postal code.