Wow. That’s certainly a pricey set! Indeed, for those on a budget, the whole thing can be made for about $30, more or less. That said, I have to admit that it looks really, really high class. Very well done.
A quick note: To make the second board (that rests on top of the board with the ropes) really strong, it can help to glue two pieces together, orienting them so the grain goes in opposite directions (which increases the strength). Using just one board is fine, but may warp later.
As for dog skin… I haven’t found any way to get it online. I researched it and found that it’s completely illegal to import into America. Goat skin, no problem. Dog skin, big problem. Why? Well, I guess dogs are just . . . cuter than goats? Anywho, I’ll stay out of that issue. Until that changes, the only way to get it is to go to a shamisen maker in Japan and convince him to sell you skin.