Originally Posted by
ChampChump
The Groppo Trail is one of the cheapest options, but not tricycle gear. Might be worth a look.
Trail
The latest offering from the same stable is even cheaper, but not close to your requirements!
But do make sure that any kit you buy is approved by the LAA or BMAA, and you have an inspector happy to work with you and appropriately qualified, before you part with a penny.
G