Yep, Ebay is certainly a source for cheaper replacement parts, and I occasionally do that, too. Sometimes you do ok and they even fit and work as claimed.

But YMMV. Anecdotal example: I recently ordered a Stens oil filter for my Kubota GF1800 from a very active Ebay vendor, relying on the vendor's product "Full Item Description" detail page for assurance it would fit that model. It arrived quickly, but the site detail had been wrong, and it clearly was the wrong part. No big deal, that stuff happens, and I didn't need to install it right then anyway. But still a nuisance. Return shipping would have cost more than the filter. Messaged the vendor to let them know so they could fix their site, and asked if they were able to send me a return shipping label. After several days without a response, I messaged Ebay's customer service out of curiosity. Even without my asking, Ebay refunded the full price the next day! Still haven't heard back from the vendor.