PiggyCoin was added to some more exchanges recently:
NovaExchange, based in Sweden apparently, has been going for a while:
https://novaexchange.com/market/BTC_PIGGY/
https://novaexchange.com/market/LTC_PIGGY/
https://novaexchange.com/market/DOGE_PIGGY/
and they even have some PIGGY basemarkets! Examples:
https://novaexchange.com/market/PIGGY_1337/
https://novaexchange.com/market/PIGGY_BUN/
https://novaexchange.com/market/PIGGY_DGB/
https://novaexchange.com/market/PIGGY_RBBT/
https://novaexchange.com/market/PIGGY_LDOGE/
https://novaexchange.com/market/PIGGY_SMLY/
TradeSatoshi, a new exchange with a London, England, mailing address, are in beta until December.
https://www.tradesatoshi.com/Exchange/?market=PIGGY_BTC
https://www.tradesatoshi.com/Exchange/?market=PIGGY_LTC
https://www.tradesatoshi.com/Exchange/?market=PIGGY_DOGE
Crypto-Trade, not sure where they’re based, even have some fiat deposit options! Their user interface could use some work though.
https://crypto-trade.net/exchange?base=PIGGY&counter=BTC
https://crypto-trade.net/exchange?base=PIGGY&counter=GBP
https://crypto-trade.net/exchange?base=PIGGY&counter=USD
Note: Please don’t keep too much money on an exchange in case it gets hacked or the exchange owner runs away! Be sure to use 2FA/MFA if possible!