Here are some playmats you can print out and use. They are mostly in Japanese but the main parts are in English. You will need an adobe acrobat viewer as these are pdf files. Just print them out and place together for your "field". Four pieces make up each playmat. Print out on size A4 paper.
2 Player Playmat
Download one http://www.bakuganbuzz.com/playmats/battlefield-2p-1.pdf (http://www.bakuganbuzz.com/playmats/battlefield-2p-1.pdf)
Download two http://www.bakuganbuzz.com/playmats/battlefield-2p-2.pdf (http://www.bakuganbuzz.com/playmats/battlefield-2p-2.pdf)
Download three http://www.bakuganbuzz.com/playmats/battlefield-2p-3.pdf (http://www.bakuganbuzz.com/playmats/battlefield-2p-3.pdf)
Download four http://www.bakuganbuzz.com/playmats/battlefield-2p-4.pdf (http://www.bakuganbuzz.com/playmats/battlefield-2p-4.pdf)
4 Player Playmat
Download one http://www.bakuganbuzz.com/playmats/battlefield-4p-1.pdf (http://www.bakuganbuzz.com/playmats/battlefield-4p-1.pdf)
Download two http://www.bakuganbuzz.com/playmats/battlefield-4p-2.pdf (http://www.bakuganbuzz.com/playmats/battlefield-4p-2.pdf)
Download three http://www.bakuganbuzz.com/playmats/battlefield-4p-3.pdf (http://www.bakuganbuzz.com/playmats/battlefield-4p-3.pdf)
Download four http://www.bakuganbuzz.com/playmats/battlefield-4p-4.pdf (http://www.bakuganbuzz.com/playmats/battlefield-4p-4.pdf)