Might check with the following:
Colleges that are replacing their own, possible donation to your program. Not sure if your near St. John's, CW Post, Hofstra etc. Send inquiries to Long Island HS's to see if they are replacing older nets and might make you a deal. Check with all local pro teams, minor and major league, to see if they might donate older nets. Your schools athletic boosters also might be a place to check for money and you might want to consider a funraiser for your program like a youth clinic with your players assisting, etc. We were able to get some money from the boosters and raised a nice amount from a youth clinic. You also might want to check with local indoor training facilities that are replacing nets and make a deal. Other than that you just have to shop around.