Electric Eraser- Need Advice

Can someone recommend an inexpensive… cordless eraser with easy to find refills? Jet Pens who is my source for all things pen, pencil and paper has the Sakura Sumogrip?

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A classmate made and sold these to classmates when we studied sketching.
He bought a bunch of those coffee foamers and just stuck any MP eraser cap on them. Sold them for less than 10$.

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