Brendan has discontinued making the SliderBass parts. There might be a future opportunity to bring back the product, but it comes with substantial financial investment. Before I can personally commit to such a commitment, I need to collect data and survey interest.
When Brendan inventoried the parts, he charged £250 ($331 USD). The cost of installation was $200 USD. So the total cost of the conversion was approximately $531.00, above and beyond the cost of your bass harmonica because either the customer supplied the bass or else bought one to be converted.
If the SliderBass has a future, I have to buy a minimum order of 10 units, paid for up front. My SliderBass conversions numbered approximately 6-8 per year for 3 years. I'm trying to weigh the facts, seeking to find interest in the product that would make it viable for me to invest in the parts to continue to offer SliderBasses to the public.