Do they sell flowers and could they place them on grave if possible

Yes. There are usually ppl just outside the memorial park, selling flowers. From 5 dollars on up. You can also place them on the site in which your loved one, rests.

Van Buren Florist is located 3 miles away and there is also a floral Vending machine located in the administration building which takes cash and credit. A portion of these proceeds go to help the Veterans Canteen Service

I havent seen flower vendors on site. If you bring flowers there are planters for you to use