Is there a place that I can find the going rates for more rare items on Gaia?

Something that might say the about prices for minis, A. Halo, Faust's Bottle, etc.

Please and thank you.
I was trying o get Faust's bottle by this week but I've been lazy at it because I really don't have a more definite goal. Its aout 30mil, correct?

Then I set my opes higher yet for A Halo by late next spring. (Because by then I might have enough for Faust as a birtday gift to a friend)