Move. Just kidding ( I don't know where you live ). I often state that these sockets can be found on the HELP line of products in most part stores. The counter clerk may not be aware of every item on that rack.
Most owners here are looking to replace 1 or 2 broken sockets. My niche in all this is the A-body rally panel. It is more difficult to R&R and more fragile too. So if/when I R&R one of these I will replace all 8 bulb sockets, broken or not.
Because the HELP rack might not have just 1 package of 3 sockets, I could visit every part store attempting to gather the 8 sockets needed. I just order them online and pick up in store.
I'm pretty sure ebay offers these sockets in a package of 10 if that helps.
For bulbs I use Sylvania #2825. It is a long life incandescent bulb and slightly brighter than OEM.