But IMO, last night's close, or maybe open, high, low, and close, would do.
That's something you could probably pick up off a free board such as Yahoo Finance fairly easily with a macro at about 2 am when the site is quiet. I know Yahoo has historical quotes you can download. I also know that some programs, such as Toolkit 4, can go out any time to the net and get the current price, and I doubt they pay for that. So doing that much should be fairly easy (says somebody who hasn't programmed for nearly 30 years!) and free
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Many shall be restored that are now fallen, and many shall fall that are now in honor. Horace
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Price is a crazy and incalculable thing, while Value is an intrinsic and indestructible thing. G.K. Chesterton