novelinks 4 oz Small Plastic Jars with Lids, 40 Pack Mini Plastic Mason Jars with Lids 4oz, Craft Storage Containers & Canning Jars & Small Spice Jars for Kitchen Organization (40 Pack,Silver)

I don't have a shop, but I made some batch slimes recently for my kid's birthday, for her class as well as for her party with friends. Most supplies are easy and standard, especially since you're not starting with needing massive bulk supplies I'm assuming. I made like 50 slimes total, and the only supplies I had to go crazy on were the containers. There's a pinned thread in this subreddit for the common ones. The most complicated one for me, though, were the containers. I went through a lot of different ones, to learn that a lot of the easily found ones had their own issues. Some plastics are too porous and slime really clings to them, or are kind of ugly. For some reason the glass ones are sometimes cheaper or prettier, but I definitely didn't want to use glass for kids, and I'm assuming people don't want to ship glass either, due to breakage and weight. I wasted a lot of money going through container samples, and ended up just using a mix of spare containers I bought from actual slime shops or etsy (it got pricey), as they worked the best, for her closer knit friends. The containers influenced the type of artistic liberty I was able to utilize. These Amazon ones were the most affordable and worked the best for my bulk needs (e.g. classmates + bigger party), but still not my aesthetic preferences. Since that was the most complicated thing, but also I assume the thing you need consistently the most, I'd think start there, and make small bulks for friend or smaller events with your existing supplies, to feel out what you were proud of or disliked about the experience as the curator. Start small with everything else, it'll be more than what you expect you'll use.