New to figures, got some questions (PUP titans)

I collect things aside from anime figures, but out of curiosity I looked into Attack on Titan figures because I love the show so much I’d be willing to drop some money. I saw that Pop up Parade has a female titan figure available (or becoming available soon? Amazon says September). Everywhere I see her she’s a very reasonable price, and described as L size. I saw on this reddit that they’ve already released other titans, and I’m interested in getting them as well. My confusion starts when I look into the attack titan figure and see a VERY wide range of prices. On a pricier listing he’s described as XL, and on a cheaper one they don’t include the size. Is there a range of sizes, and does this affect the price? Do all of the titans have the same size options (I’ve only seen L for female)? Someone please info dump to me I want to be informed 🙏