Moving...again

Here we go again. Rental property going up for sale and us having to move. How on Earth are you supposed to save for a deposit on a house when your spending it having to move all the bloody time I don't know. This will be move #4 in 4 yrs. All except one is cause the owner decided to sell. What has happened to long term investments? :sigh:: I know it's their property, but it becomes our home.
What can you do but pack and move.