Cost of grandmothers headstone

To start out our story goes back to 5 years ago when my father unexpectedly passed away in a car crash, just seconds from his house! Us kids was left  at a very young age to take over the farm and house. Where we have received alittle help from family and friends and once we got through this his mother, our grandmother passed away due to cancer. It’s been 3 years and we still have yet to get a tombstone because they didn’t have life insurance and it’s just been really rough on us. I just really wanted to get one soon before something happens to my grandfather because he has to tend to the graveyard every week to take care of it for the church and I know it hurts him to not see her with a tombstone. We just need a little bit for the cost of that and our family would greatly appreciate it. Thank you so much and god bless.