Nice! I see you even included your sources. However, unless I'm mistaken, for the "cheapest" part, you get info from a few big names (uniteddomains, gandi, etc), compare between them and then return which is the cheap of these?

So it means a cheaper, albeit less known, registrar might exist for any given domain, correct?

Edit: Replying to myself, I think I'm right because for some domains, you list no registrar.

For instance, .alsace [1] has a "No results found :(" for registrars, while a quick google search gives 1and1 [2] as a registrar for this tld

2nd edit: it appears Gandi also registers .alsace so I don't really know...

I found this list of accrited registrars [3] that you could probably use, but it doesn't seem to be up to date since .alsace is not included in it.

For those curious enough, registry for .alsace is [4]

[1] http://tld-list.com/tld/alsace

[2] http://www.1and1.fr/alsace-domaine

[3] https://www.icann.org/registrar-reports/accredited-list.html

[4]http://www.mondomaine.alsace/