When you search for items on Ebay, use variations of spelling, such as U-boat, U-boot, U boat, U boot. For plurals, just add a * to the word; U-boat* will bring up singular and plural (U-boat & U-boats). You can also get more results with abbreviations and the *, such as torp* to yield spellings such as torpedoes, torpedos, torpedoe, etc.