I believe Berkelys are similarly undervalued, and less expensive to keep running, with the possible exception of the under engineered bushed differential.
They certainly are a lot more attractive than Bonds, but then again if awkward under dog is your chosen alter ego- you could stick with a Bond.
Otherwise you can have what looks like a mini E type- Cobra hybrid for 1/20 th or less the cost.
Even more affordable in 3 wheeled T60 form. The hardtop T60's strike a chord with me as being attractive in frontal view, and baroque- bizarre from the rear.
For a most affordable Bond- if you can stand the look of the long nosed types, go for one of those, as the earliest ones are more cute and sought after (so more expensive) despite being crude in the extreme.
Ironically this level of crudity in the earliest examples actually enhances value, as it is a window on the evolution of the more modern- dare I say drivable, micro cars.