Boss7321 via eBay offers this Stainless Steel Pineapple Corer and Slicer for $3.15 with free shipping. That's a buck below our March mention and the lowest total price we've seen. (Outside of other eBay sellers, it's a current best by a buck.) It features a plastic handle and purports to retain the juice.
Note that this item ships from Hong Kong and may take three to eight weeks to arrive.