The only bunkers i would buy are SupAir bunkers. All the rest are just not the same.
Belive be, you will be dissapointed if you buy any other brand of bunkers. Spend the extra couple of bucks so that you get the higher quality ones. Then later down the road if you want to sell them, then you can get a higher resale then the other brands.
They make Bunkers for PSP, NPPL, Milenium Cup, NXL, XPSL, and the CFOA. You wont be dissapointed. But if you decide not to get Supair bunkers DO NOT get the Ultimate Airball bunkers. A local field just got one and its crappy. They bought an xball field kit. There wasn't enough bunkers and all the bunkers are shaped funny.