Reddit mentions of Mineral Geode Fossil Display Stands, 2” Acrylic Three Peg Holders, 12 Pack

Also, sorry for making two comments, but I recommend that you sell off stuff you don't want, especially the smaller and lower quality pieces that many start off with as first pieces.

Here's some links for specific stands that I recommend. They should be versatile and are budget friendly.

U-Stands. Great for highlighting pieces in the back of displays and adding accents, sometimes can be rotated to create a two level effect.

Easel Stands. Good for displaying slabs or even books.

Sliding Stands. Good for vertical pieces, and can hold much more than you would think. Really wide pieces can start adding too much weight, so don't push them too far.

Peg Stands. Subtle and easy to incorporate into any display. 1 2 3

Slotted Acrylic Stands. Meant to hold labels so they're easy to see for pieces in the back or on higher shelves.

Here's a comment with some stand recommendations that I gave to someone else.

Here's some links for specific stands that I recommend. They should be versatile and are budget friendly.

U-Stands. Great for highlighting pieces in the back of displays and adding accents, sometimes can be rotated to create a two level effect.

Easel Stands. Good for displaying slabs or even books.

Sliding Stands. Good for vertical pieces, and can hold much more than you would think. Really wide pieces can start adding too much weight, so don't push them too far.

Peg Stands. Subtle and easy to incorporate into any display. 1 2 3

Slotted Acrylic Stands. Meant to hold labels so they're easy to see for pieces in the back or on higher shelves.

This is all really for cabinet sized pieces, but I don't really know what you have so this may or may not work.