Can I buy a used Helium miner?

I'm considering investing in cryptocurrency mining, but I'm on a budget. With that in mind, I'm wondering if purchasing a used Helium miner is a viable option. Are there any significant risks associated with buying a second-hand miner? Will I be able to achieve the same mining rewards as with a brand-new miner? Are there any specific factors I should look for or consider before making such a purchase? Additionally, are there any reliable platforms or marketplaces where I can find trustworthy sellers offering used Helium miners? Your insights would be greatly appreciated.