Not exactly cheap, but at least at half-price from the venus - I can vouch for the Hismith premium sex machine.
Can be used with dildos or a male masturbator cup (about $40-50, comes with a slot and a vibrator bullet in the fleshlight-like, fully removable sleeve). Suited best when you're upright (sitting or kneepoint psuspension for instance), but with a bit ingenuity you can easily mount it somewhere to use while lying down. Height and angle are adjustable, it can even be setup vertically pointing up with the default mounting rods.
If you have a female partner or enjoy anal play yourself, just plug a dildo on there (from their site with a built-in connector or by using a disk attachment for your own dildos with suction cups) and go to town.
Very sturdy and quite heavy, quiet (albeit not completely silent), comes with a corded and wireless remote to adjust the thrusting speed, the latest model I think even has app control).
Fun anecdote:
I ordered mine ~4 years ago directly from HiSmith. I thought I ordered from their site in the Netherlands, but it turned out they would ship from China. After it got stuck for 8 weeks with no further tracking updates, I got buyer's remorse and cancelled, first with them directly and after I felt they were trying to bamboozle me for another three weeks without providing any useful updates or information, I cancelled via Paypal.
Another 6 weeks later, UPS was at my doorstep and left me standing there, scratching my head and with a brand new fucking machine.
Tried to do the right thing and contacted HiSmith on how to pay for the shipment (and maybe haggle down the price a bit for the abysmal experience), but they never replied or contacted me afterwards.
Yay, free pleasuring device. Would I buy it again at full price if it broke? Yes, definetly. It's a lot of fun.
They also sell through Amazon in most countries though, if this episode makes you feel iffy about their reliability.
The product itself is top-notch.
Should you decide to spring for it, make sure you get the latest revision and attachments with the "KlikLoc" mechanism, and not the old one, which still may be in some warehouses.
https://www.hismith.com/de/hismith-brand...dildo.html
https://www.hismith.com/de/hismith-brand...results=11
Life's too short to pretend you're not into some kinky shit.