The bracket for the pole to set into is fairly easy to get. Look at sporting good stores, rv stores that kind of place. The bracket is very common in size. As for the table top like said before the big box boys have pre made ones. The post is a different story. I have tried to get shorter ones through the mfg. they are made but very hard to find. I was told that Bass Pro could special order one, however never followed up on that.
We got the 24" round and put bar top lacquer on it. Works get, left the pole the same height.
Retired and never looked back