Currah µSource

Brand: Currah Computer Components Ltd.
Model: µSource
Country of origin: United Kingdom
First year of production: 1986

Price: £44.50 initially, £19.50  re-release

FORTH, Assembler and a debugger in a cartridge.
Currah went bankrupt in 1985. The OEM of the device, Quadhouse Computers, sold the remaining stock at a discount.