This is what i do..
1) I go to expireddomains.net and type in the word in need and get the list of domains and filter in descending order of backlinks and copy them to clipboard
2) I go to semrush batch analysis and place all the domains. (I registered for 15-day trial and am still getting batch analysis free)
3) After checking decent domain authority I will visit then visit the website. I have installed moz toolbar. Its free. I will check the spam score
4) If its fine. Then i will move to web archive and check whether it has any Chinese text or anyone else has done 301 redirects earlier.
5) If its all fine then i will go to ahrefs free backlink checker and check domain rating.
6 )If moz, semrush and ahrefs domain ratings are somewhat similar I will buy it.
You don't need to have any paid subscription.