I went to that site. Found this page for Ordering http://www.discriminator.nl/order/index-en.html
There's a 4 level interface for EUR 6.00 or $8.82 US.
I'm not interested in digging out my old board etching kit and sourcing parts right now so the price was appealing.
I clicked on BUY and the price jumped to a whopping 63.50 EUR or $93.33 US with shipping. Arg, guess the 6 EUR is just for shipping. Way over priced.
I would settle for soldering a kit together if the price is right.
Depending on what you want to do, you really don't need a data slicer for most of the newer apps. If you have a tap installed on your radio, all you need is a feed into the sound card on your pc. But, there will still be some legacy apps and specialized stuff that will need a slicer.