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.
For the unaware: A patient wore a buttplug into an MRI, because it was marketed as 100% silicone. It had a metal core. It was rocketed up into their abdomen. The patient survived with serious injuries.
My first toy was hard plastic. After a couple years the painted coating was coming off. After that I only buy medical grade silicone, sometimes with hard plastic bullet inserts which can be replaced but never even touch my skin unless I'm taking them out for washing or replacing the battery.