Specifically for /CL .. Nothing fancy required - High, Low, Open, Close, etc. would be a good start for the last several years. Preferably free, but willing also to pay fair value.
'Actual' 1 min or 'Continuous' 1 min one-off data purchases $220 -330 /per symbol for its full history
Market DescriptionCQG SymbolDaily Start Intraday Start
Crude Oil (Settlement) CL 1983 Mar 30 1987 Sep 01
Crude Oil (Combined) CLA 1983 Mar 30 1987 Sep 01
Crude Oil (Globex) CLE 1983 Mar 30 2006 Jan 16
If you can find someone with a professional Bloomberg terminal that is the very best time and sales data available. In the past, I have paid for CQG data. As I recall it was a couple hundred bucks.
Be very careful about the quality and cleanliness of data you don't pay for. It really is a fool's errand to invest your considerable effort and time with errant data that can't be trusted.
If you need live T&S and quote data, NxCore. Lots of history too, but you'll pay for it. Norgate is good for daily and very clean - covers all the liquid ones worth trading - not free but certainly affordable unless you're an e-mini trader with 4 figure account size.
Thanks! Sounds like I need Ninjatrader just for this. Does the Kinetic data include exchange traded spreads? I'm looking for non-continuous, non-adjusted eod data for the last few years