Where is ‘Asbury Park’? I have a feeling you might be in the USA, so the prices we pay in the UK will be less relevant.
However, the kickstand was a pretty regular bicycle part of the late 60’s early 70’s and I would not expect to have to pay too much for one over here. £10 maybe? The 4-speed shifter will be harder, I think they might be repairable, but sourcing another will be £15-£20 on ebay in the UK. Saddle post is a simple 1″ chrome tube and the saddle will depend on what you want. Here I would expect you could get a tatty saddle for a few pounds, or have to pay £100 for a leather Middlemore with a Moulton badge. The chain you can get new from a bicycle shop for whatever chains cost you.
Any use?