The eShop is pretty bare bones, like the online service, but serviceable. There are titles that are dropping off the main page and can only be found via search. A neat little tip came up at reddit in which a simple search for demo will show titles that offer trial software (Snipperclips, Just Dance, PuyoPuyo Tetris, and Blaster Master Zero).
A comment mentions this can also be done in the "JP eShop too if you search for "taiken" (体験). Click the search bar to bring up the keyboard, choose the 日本語 keyboard, type in "taiken" and choose the first auto fill option to input the kanji. (To save you the time, Snipperclips, Spelunker, Puyo Puyo Tetris, Dragon Quest Heroes I & II.)"
Nintendo might add a section that does this later on, just like they did with the best sellers,
but in the meantime use it to your heart's content.
