Looking for a Helicopter kit, preferably 450 size.
Something for beginners and is budget-friendly.

(Also quick question: what happened to Hiller Hover Why did they have to shut down?)

Have been looking for one as well, haven't been able to find anything.

Went to RCBazaar's store last year, they said the Hiller Hover will be back in stock in a couple months but it hasn't so far.

Ouch 
do let me know if you have any luck with RCBazaar

https://www.rcmarketcity.com/drone/drone-frame-kits/tarot-450pro-fbl-rc-heli-kit

Best for beginners