Ultrashroomz on 24 May 2016
I have every Smash amiibo ever released so far except for Peach, Zelda, and Samus.
Once I get those three, along with Cloud, Corrin, and Bayonetta, I'm done with amiibo.
As for which ones are cheap, it really depends on avaliabity I guess.
Some of the more recent ones like Ryu and Famicom ROB are readily available, and I think I've seen them drop price on Amazon sometimes. There's also ones like Marth and Falco, who just sit on the shelves of Best Buy, all dusty. 
"Just for comparison Uncharted 4 was 20x bigger than Splatoon 2. This shows the huge difference between Sony's first-party games and Nintendo's first-party games."
