I love the wooden modular card holders from Laserox. Not sure if they ship to the US, though (Switzerland here (-: ). They are stackable, come in different sizes and connect horizontally through magnets. You can build whatever card holder tower you require.
For smaller and more bespoke “holder solutions” (cards, tokens, meeples, …) I also use a Bambu X1C which works like a breeze. I don’t have time (nor fun) to fiddle around with a 3D printer until it produces something acceptable. The X1C is so simple to use that even my husband (whose greatest technical achievement is to switch on the light) can easily work with it.