I spent a lot of time with this in excel, but in order to paste it properly I had to make a screenshot of the spreadsheet.
I am very happy with the amount of money I spent on the invitations overall. I tried to gauge what the actual cost per invitation was for me including all factors, so I hope this is helpful for anyone else looking to DIY their invitations. I thought it was sooo worth it, but this was an important piece to me (read: i was a little OCD/wedding inspired) and I had lots of help.
This project was worth it to me--and I realize I could've spent a lot less (or a lot more!) on them. I saved where I felt I could (family design help and no reply card envelope), and splurged (the pocketfold and postage for it)
Please let me know if you have any questions--I'd be happy to answer them!
(oh, the one thing I forgot was $6 for the graphics we used, via istockphoto.com)