Alternative to Balsamiq (that costs less than $500/yr)?

I use one of the free wireframe toolkits (https://speckyboy.com/free-wireframe-templates-mobile-app-we...) with Powerpoint or Keynote.

You can make them interactive by assigning an action to a button and making it go to another slide. Not as good as Figma, Wireflow or Origami, but gets me 90% of the way there.

Penpot could be worth a look: https://penpot.app/

I'm still hand-drawing pictures and linking images to do app-mock-simulaton. All the tools seem too complicated for me

draw.io?