I think a lot of hotels/guesthouse don't charge for a joiner. You can find a lot of these hotels on
www.phuketdir.com They show all categories, cheap and expensive rooms and you always can send an email to the hotel to know if they charge a joiner.
Enjoy your trip
Will be in Kamla (and often in Patong) from 6 May to 22 may, so if you need a little help, you are welcome
