Before I got my blocks I was just using the boxes that my cats food gets delivered in lol.

I bought this set, so I got more than just the blocks

https://www.amazon.com/gp/aw/d/B07SVYX2ZD?psc=1&ref=ppx_pop_mob_b_asin_title

I’m a bit confused on how you could be so inflexible that you’d need more than one on each side. There’s technically three heights to every block. Also, I’ve found only a handful of moves that I use a block on both sides at once. Therefore you should have two blocks available for one side most of the time.