Data such as OHLC at the per-minute granularity even or further at the tick level is available commercially from a number of data providers, including Nomics and Kaiko, for example.

For the rest of us, many sites with charts, such as CoinGecko, provide historical daily close data, where you can choose a date period and see closing prices.

October 31, 2015 closing price was $325.

See also:

https://Reddit.com/r/CryptoMarkets/comments/bto3i2 [Teddit]