For reliability, if you just want a vibrator of some form factor to work with, go with something by Lovense (except for the Max, which is kinda shit). Easy to get, just works most of the time, decent ecosystem.
https://lovense.comIf you just want the absolute god damn cheapest but still computer controllable wand, the Youou Wand for $16 (I buy these in bulk to give out at workshops): https://www.amazon.com/gp/product/B07F6XWF2F/
For strokers, Kiiroo Launch (aka Fleshlight Launch but branding is changing currently). Not the best thing on earth, but it does the job right now and there's currently an open source firmware rewrite happening (because there's some masochist out there that loves reading PIC24 assembly. Yes it's fucking PIC24 based.)
If you've got a 3d printer, the (currently mostly penile stimulation focused) OSR2+: https://patreon.com/tempestvr. Something like $2-8 for plans, 3D printable in about 2 days on a stock printer, multi-axis movement, vibrate development community and a ton of add-ons happening.
There's also really interesting DIY stuff happening on the vibrator/small controls side at:
https://www.touchyfeely.tech/
http://www.bodyinteraction.com
