I have the Ever Sewn 30 Sparrow, it has zig zag which is adjustable in both length and width so would do what a serpentine would do, just more angular.
That said, I've used my 30 a lot and wouldn't use it for machine quilting, I love it and don't want to wear it out, it is a lovely piecing machine.
I also use my Janome serpentine stitch and walking foot for all the machine quilting I do do and like it very much.
But... you can do a serpentine on any straight stitch machine by gently moving the quilt back and forth yourself, I've done it twice on my old 1960's straight stitch before I had this machine. Buying a machine for one stitch doesn't seem practical in my book.