Something that isavailableis nearby and able to be used.
Hand sanitiser is available at every ward entrance.
The opposite ofavailableisunavailable.
The car was unavailable, so I had to walk.
You can also say that something ison handor, in UK English,to handif it is near to you and available to use.
The emergency services were on hand.
UKKeep an eraser to hand in case you make a mistake.
When something is available to buy in a particular form, you can use the verbcome.
These shorts come in red, yellow, or blue.
A book that is available to buy isin print.
The book is still in print after 65 years.
If something is available to buy in a particular shop, it isin stock.
Do you have this blender in stock, or do I need to order it?