$39?!? That's incredible. I went to elementary school in Japan, and ever since have had an obsession with Japanese toilets (electronic bidets, air dryers, heated seats, etc., etc.), but all the toilets/toilet seats that Toto (the main manufacturer) sells in the US are hundreds of dollars (and the top models are in the low four digits). $39 for a bidet! I know just where I would stick that... well, er, thanks for the tip.
How is it working? Would you recommend it? (The Japanese models tend to have heated water, which is a bit more pleasant.)
Honestly, it seems like not having any toilet paper available would be a sufficiently strong motivator. They just need a push to get over that initial hurdle, and then they'll realize how awesome it is!