If you can’t install yourself the $200 of that is likely going to be consumed by install cost.
Big 3 and amp power wire - $110
deck - $80
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Sub - $150
a beefy 10 is a good idea so you can slightly manipulate output by increasing box size
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Box - $150
audiobahn recommendation . Yish that’s an expensive prefab I bet if you checked your local craigslist or let go there’s a guy near your that builds enclosures who could shave that cost for a bare bones box
wire reducers - $12
rca -$12
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speaker wire - $20 (save the rest for when you your doors)
fuses/holders - $14
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The option I laid out requires you to crimp your own lugz to wire but you’ll have to that with the kit too so you might as well do em all. Also a spooo if wire is good so you’ll have it when you do your doors