Greater Dallas Youth Orchestra: https://www.gdyo.org/
Dallas Asian American Youth Orchestra: https://daayo.org/
Greater North Texas Youth Orchestra: http://www.gntyo.org/
Young Strings Orchestra Program (Dallas ISD): https://www.mydso.com/educate/young-strings
If you are ready for an upgrade from the school instruments, I recommend the following locations:
https://www.dallasstrings.com/t-instruments-for-rent.aspx