High quality science birthday invitations with a twist! Let them know what’s going on, plus give them a link to our growing list of >100 free science experiments on our website! Cost $0.66 inc. GST per birthday party invitation Postage free within Australia. DL size to suit business envelopes. Orders are dispatched within 5 working days after your order. Ordering is simple; just let us know how many you need and we’ll organise them to get printed and sent out to you by regular post.