I have seen the 50s go for as low as $50 in the last few years. I think the last one on ebay went for around $100. The 25 and 100s showed up on ebay years ago. The seller would not disclose what he had and after he kept listing them, the prices dropped fast. I still don't think there were too many 25s or 100s though so I would assume that chip is worth more IMO. If they were mine, I would sell the 50 in the $100 range, and the 25 I would ask for around $150 to 200. Maybe Lighterman or Hanover can shed some light though!