If I'm not mistaken, looking up transactions on blockchain.info does that well enough. You just need to click on the value amount to toggle between Bitcoin and dollar value. It will show you the current usd value but if you hover the mouse over it, it will also display the value at time of transaction.
I was aware of the toggle function on blockchain's explorer but didn't know the result by hovering over them (somehow I missed it [face-palm]). Thank you for this, you're a life saver (considering how long I've been looking for this).
Don't know how far back it goes as I've only ever checked txs of my owm from last year.
Did some digging and found out: It shows values/prices from 2010/08/18, till present:
- That's the starting date (
according to their chart) that has value in it.
- Checked also the transactions from
this address, (results are accurate).
/locked.