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I would definitely check this one out from Amazon. It's about $20 USD, comes with various sizes of rings in case one fits better than the other, and you can pick from a couple different sized cages. I have the nub size, which is about 0.8 inches, so extremely small! Needs a bit of sanding down on the edges as they are sharp (sandpaper included when I purchased). Hope this helps! I'll post link below.
Totally buy this bad boy😘
They come in different colors
FYJENNICC Male Briefs Medical Grade Resin Breathable Men's Underwear V3 Nub https://www.amazon.com/dp/B087QGV4LT/ref=cm_sw_r_cp_api_i_TZQzFbNBY0Q4B