Aside from doing very poorly in elementary school band, I've done little in the world of music creation. Shopping for a gift, I accidently found myself very interested in the Pocket Operators. I picked up a Sub and a Rhythm, and I'm really enjoying them. I paid $39 US each, but I'm seeing now that this might be a promo price. My question is about Pocket Operator price history. Can one generally find a PO at around $39 year round, or should I buy any additional models I want today?