EBay is a venue. Asking eBay for help (outside of the Search feature) is like asking the shopping mall management to do your grocery shopping.
You did not buy from eBay. You bought from a private seller who rented space here. Contact the seller.
However, many sellers sell surplus goods which are only occasionally available to them.
You would be best, if the Search is not successful, to look in your phone book for a local dealer in that brand. Or try Staples.