It’s almost always better to not buy a cheap sex toy. There’s no regulation of the industry and many materials in cheaper toys are just straight up dangerous. Here’s an article (it’s NSFW, there are pictures) that goes over what materials are and aren’t safe.
The closest I can offer to what you’re asking for is that there are some e-readers that use Android. I own a Boox Page, which is one of those, and I’m happy with it. Boox products are a bit on the pricier side, but they do offer features that can be difficult to find on other manufacturers’ offerings, such as a micro SD slot.