This is link will take you to the GB site, if you're not in the UK please check as I think they are also offering the same freebie in their other countries!
FREE Feliway Travel Spray if you purchase a diffuser which is about £29.00 in ZooPlus.
"Feliway® can be used to help comfort and reassure cats, while they cope with a challenging situation and/or help prevent or reduce the stress caused to a cat during a change in their environment."