I would say you would have to pay attention to what tv shows or movies coming out that could be related to a comic. This forum is good tool to use and so is the Cover Price website. It follows the sales of comics. Check them out and see if any of there services might be good for you.
I use CovrPrice as my online collection database. Depending on the size of your collection it will be a considerable time committment on your part to enter all of your books.
It’s not exact or perfect, but you definitely know pretty quickly what is hot.
And as was mentioned above, it is a pay service with an annual fee.
CLZ comics is an app that you can use to database your comics it does tell you which is the most valuable books and when you update the pricing data it shows a list of which books that went up in value and by how much. It does cost I think $7.99 a year.
I use comicbookrealm.com as well. If you invest the time to upload your inventory, you can run reports from within your account. It’ll show your specific books that have moved (up or down) in the previous 30 days I believe. Prices are mainly changed after users bring attention to specific books in the Price Check on Aisle X forum so it’s not perfect, but a tool I find very useful.
That’s what I use in addition to Anthony posting the top 10/runners up on Thursday evening, and checking CBSI Hot 10 each Friday. Between that and reading the message boards here, I’ve found this to be pretty sufficient.
I use CLZ to track my collection (grandfathered). It’s only graded prices though.
I pay for covrprice and I sent them the csv outputted from CLZ. They “uploaded it” with a 50% miss rate. So I know what a random half of my raw collection is worth… not sure why I still pay for it! I’ll never have time to manually input everything to another service. Hopefully CLZ steps up their raw game!
Simply assign a grade to your raw copies and put it in CLZ. If they ‘pop’, according to CLZ, you will then be informed of any price changes in your books, by CLZ.