I'm not sure what your team has already done or tried, but these are things that FRC Team 3787 has been doing.
Search for grants through the internet. Search terms would include "STEM Grants" or "FIRST Robotics Grants." The team I am apart of is in Washington and we have a Washington FIRST website. It has a list of FRC Grants teams can apply for as well as many other resources. Does South Carolina have a website like this? Also, some companies do material grants, so make a wish list of items your team may want or need.
Getting the team known in your community is another big thing. Get yourselves known in the local newspaper, volunteer and setting a display during local events (County fair, school assemblies, etc.). When the community is familiar with you they are more likely to interact with your team and want to help your team succeed.
If you create a packet list some accomplishments and goals of the team. MrJohnston has a good list for you
I hope this helped you guys out a bit!