Hi E.,
I live on Long Island also. It depends on what you are looking for. If you would like a Toddler Bed, you can use her crib mattress. We purchased a Toddler Bed for our daughter at Toys R Us. She is just turning 4 now and we just purchased a twin bed for her. Behr's Furniture has a great selection of kids bedroom furniture on display, details are as follows:
Behr's Baby & Kids Furniture is convieniently located at:
1220 Hicksville Rd, Rte. 107
Seaford, NY 11783
Phone:
###-###-####
When my son was 2, we purchased a Little Tikes Racecar bed for him, which can use either a twin size mattress or a crib mattress.
Hope this helps!