Just about any custom string make can make a replacement string exactly like the original. You can specify string and serving color. Make sure you tell them the stated bow length and draw weight.
If the one you have is not worn bad, you should be able to wax it good and continue to use it.
I have my own source where I buy strings but I am reluctant to state is here as they are not advertisers on tradgang.
I know Jim Raines is a regular on this forum and he can make a string for you..
Hope this helps