I need a breast ultrasound. :(

I found a lump on my left breast a few months ago. I went to the doctor today which was a free clinic because I do not have insurance. The doctor verified the lump along with nipple discharge and ordered a breast ultrasound to find out what exactly is in my breast and what to do about it. However since I don't have insurance I need to pay for it in full before the procedure. It will cost close to $500. I know it's the holidays and everyone is short but please if you can help by sharing and/or donating it would be GREATLY appreciated. I am scared and nervous and just hope it's something that can be resolved quickly. Thanks for reading and thinking about me.