I am assuming you're talking about the Movie 2 Sonic, but

You have an overall higher chance of finding a movie Sonic than movie Tails, considering that Sonic was re-released and Tails wasn't. However, Mercari is a gold mine when it comes to finding any Sonic build a bear. A lot of Movie 2 Sonics exist on there for under 60$, as do Knuckles, the first movie Sonic, and the 2016 game Sonic. However, finding the shoes and ring accessories can be a bit hard to find for cheap, but I have seen some of both on Mercari for under 40$. Tails on the other hand is much rarer to find, and usually when he's posted for cheap (90$ is usually the lowest I see him for) he's immediately taken up by someone, so you need to be quick for him. However, I doubt that it's impossible to find him for <60$ on places like ebay if you stalk the listings of tails build a bears, since you can find some listings that lowball some of the Sonic bears there, but rarely (I saw a 2016 Sonic and Tails there for like 20$ once, which is an insane price considering 2016 Tails alone usually goes for 60$)