My Morino was $40 (Canadian) when I bought it. It was around $50 for the shipping included in the end.
Like TigerLily said, it's usually 30-50. I've seen them as low as $20.
I recently bought a pair of Morinos for $80 Canadian including shipping, so thats like around $35.
For the older Tamagotchis, I find that reasonable because they're not made anymore. So they're pretty rare. But best if you buy them now; Prices are increasing!