You're on the right track, for sure! You could use 'Comparative Sales' for something brand new donated, as well as 'Present Value' (which could equate with FMV).
I use 'thrift shop value' mostly, for used items donated to Goodwill, Salvation Army, etc. For instance, I know they sell t-shirts for $2-5 there.
It's definitely not an exact science; as long as you can verify how you arrived at a certain value (if the IRS asks).
Here's some donation guides from Salvation Army, Goodwill and the IRS to help you.
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