Added pagination

[zacoppotamus]

No description provided.

[p2]

Hey, thanks for this. While it works it's a rather hacky solution. Things I would change:

• create a _get_url() method that is used by _get() so you don't have to manipulate next_page and can use as-is
• create a sub-method of the parsing in _sales() so that it can be called recursively
• remove the whitespace fixes in your diff