We can see you are the kind of person that likes to plan ahead, good on you! Here's a tip: while you are waiting for your stick to run out (they last about 3 months with daily use) keep your refill block in the freezer so that it remains deliciously fresh. When you are ready to use it, simply take it out, let it defrost and then melt to refill your stick!
Remember to store in an air-tight container if using as a block to stop it drying out. However if it does dry out you can just scrape of the edges and keep using it!