If you've missed out on the offer, they're only $0.99 at the Amazon.com Kindle store, or about £0.72 at the Amazon.co.uk Kindle store.
Kidnapped US
Catriona US
Kidnapped UK
Catriona UK
I haven't put the ePubs into distribution yet. If anyone wants ePubs and asks before I get around to it, I'll send them free copies. I'll update this post once they're available at the usual ePub locations.