after about 60seconds of google I came up with this
Wooden DIY cab kits. £70+ (ebay)
Joystick kits £35+ (ebay)
Add an old monitor. Plenty of non 1080p panels now for free or £10 max..(FB market)
Add anything with a cpu. Possibly free but lets say £10 max again. (FB market)
Old 2.0 speakers to use or tear apart and fit in the cab. £5 (FB market)
So for somewhere ~ £130 you can make a 6k cabinet
Or even simpler just get a Pi and Pimeroni set up, smaller and a little more expensive but easy to make.