Just a friendly advice.
The solutions that you seek are all quite rare, and are basically collectors items nowadays. They all cost more, or in the range of any accelerator card with ram slots on it. Performance wise, an accelerator with on-board ram also puts any of the above mentioned expansions to bed, any time of day.
Just to give you a hint of what you will be paying is the current going price for DKB 3128. It goes for about $300USD on eBay.
