What is the best alternative to Articulate Rise?

It depends on what you want to change: the cost per author, building inside PowerPoint, or presenter-led video instead of scrolling pages. Each points to a different tool.

Is there a cheaper way to keep using Rise?

Articulate lists a single-seat Personal plan below its Teams price. Check its pricing page before you move your courses.

Does Reigniter export SCORM 2004?

No. Reigniter exports SCORM 1.2, on the Interactive Training and Agency plans.

Articulate Rise alternatives, compared by what each one changes

the right alternative depends on what you want to change. If it is the cost per author, compare Articulate's own Frontline, Easygenerator and iSpring. If you want to build inside PowerPoint, look at iSpring Suite. If you want presenter-led video modules instead of scrolling pages, look at Colossyan or Reigniter. If you like how Rise works and only want it cheaper, check Articulate's single-seat price before you move.