The phrase "limited availability" means that there is only a small amount or a short period of time in which something is accessible or obtainable. Full definition
Because of limited availability of resources, production time and value were difficult to attain. (sparkhire.com)
The above offer is also listed as an online pilot with limited availability so make sure to take advantage of this now if you can! (pointsmilesandmore.com)
The food has relatively limited availability in stores, so be sure to check with brick - and - mortar retailers before making a trip. (kittycatter.com)