But there are some inexpensive ladders at Bunnings that can take me a few steps further up to adulthood. For reaching high shelves, there's a two-step folding ladder for $18.90. This can be tucked in a cupboard or shed, or around the side of the fridge, when not in use.
Of the various higher ladders, I think the best value is the Rhino Dual Purpose Aluminium Ladder at $89. You can use it as a regular A-framed step ladder up to 1.8m, or flip the other side up to make a 3.3m straight ladder for leaning against walls, etc. It takes 120kg.
If you invest in a ladder, you'll get years of use out of it.