The 3100s could probably be sold for a small sum. Someone might also buy the 4100. Try posting here. If that does not work, Kijiji or eBay might. As a last resort, check for local municipal recycling centers. You might also want to check out Procedures for Buying and Selling of BTV Receivers
You can scrap the receivers and shred the cards. If they still work, I would try to find a buyer first. A 3100 is still a valuable receiver to many people and some may prefer a 4100 to newer models. Just be aware that scrapping the receivers will leave them on your account indefinitely, even if you call Bell and try to remove them from your account. Technically, the cards belong to Bell but I've yet to hear of them wanting them back, except for upgrade purposes.
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