Novaexchange is a young-ish exchange based in Sweden. They’ve added PIGGY!
https://novaexchange.com/market/BTC_PIGGY/
Over the next few days they will be having occasional giveaways of PIGGY in the Trollbox. Novaexchange users who are also BitcoinGarden forum users can also take advantage of giveaways on the BitcoinGarden forum by registering here: