This app was mentioned in 8 comments, with an average of 1.50 upvotes
This Pokellector app is great for organizing Pokemon collection card based on series and keep track which one you need to collect. Above are the link to download the app on your respective mobile device.
https://play.google.com/store/apps/details?id=air.com.pokellector.mobile
Use that app to assess valuation of singles, market changes daily so no one could really advise better than the market on day of purchase.
The app is called Pokellector. It allows you to scan a ton of codes quickly, and then you can email them to yourself. It works really well and I haven't had a problem with it so far.
I have it for Android, but I believe my iPhone friends have it too. Apple Store link Android version I was forgetting the exact name. Pokellector.
https://play.google.com/store/apps/details?id=air.com.pokellector.mobile
I like to use this app to keep track of cards and their price
Maybe Pokellector is what you're looking for.