Commodore calculators - research help requested

[Gene]

I'm working on a presentation for this year's HHC 2017 in Nashville (you are coming, right?) and could use some help.

I'm focusing on the scientific models (defined as at least having trig functions - don't care about anything without them), programmables, and their financial models.

What I am looking for are these facts:

Introduction date
Introductory price

Models such as the SR-36, SR1400 SR1800 SR6120R, SR4912, etc etc. If it is a commodore and had trig or programmability or financial functions, I'm trying to track down the date of introduction and the original price.

I have plenty of online ad images showing pricing at various points and can find those fairly easily, but when was each model introduced and at what price?

Anyone able to help? :-)

ty