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Most expensive produced toy I've bought was a Gojirus Giga, for nearly $200. However, I've spent way more on toy projects for my own brand and for school. Like if I had to pay to print my buildable figure for class this semester it would already be up past $200, and that's only for 1/4 the whole planned set. Luckily my classmate has a printer so I've been able to barter with prototype toys and free personal use of my 3D models.
If we want to get super vague my entire university career has been on the pursuit of a toy design degree so however much that total's up to so far.