How to get list of backlinks for 5000+ subpages?

Hello.
I have a list of 5000+ subpages. For each of subpage I want to get complete list of backlinks for subpage and domain.
how to do it when I want make it as cheap as possible?
Which tool can I use?
I've heard about Moz API - I can make up to 2500 queries / month, 6 queries / second. But FREE api is limited.
Also Majestic SEO ... cost 300 USD/month, if I want to have API
Ahrefs - with 7$ trial for 7 days I can only check 100 domains per day (500 urls / day). So it's only 700 domains for this trial. But I have 5000+ subpages...

Do you have some ideas?

Hi, If it is a limited number of pages, you should try getting a customised crawler made. An scraper can pull that information for you within a couple of hours. Let me know if you need any help with that. I can help you too