Invitations

Would it be inappropriate to send invitations that have been addressed from the computer with calligraphy writing? The cost for 1 invitation , inside envelope and and response card is $5.00 each if it is real calligraphy. Can`t afford that. Would using the computer printing be appropriate or not? I am not talking about stickers but each envelope put through the printer? please advise. This will be a formal wedding andI certainly don`t want anything to go wrong. I am just trying to save $1000 or more. Is it really that critical to have it printed in pen??? I know you can have your addresses printed on your envelopes when you order invitations but just didn`t know what was proper. Thank you