“Surprijs” is a word play on “surprise”. “Prijs” means price and sounds like it as well. It’s auditive squinting: take Dutch words and mispronounce them until they sound like English ones. Surprise in Dutch is also “surprise”, although it is pronounced “sur-preeze” like in French. This implies that -prise, pronounced -prize in English, should sound like -price, as many Dutch people mispronounce price and prize.