Pretty much any esc will work with single-cell LiPo, what they need is a voltage booster and sometimes a little different routing of some wires.
I've got a few of the inexpensive HK boosters left I could sell you for $10/shipped for one, add $8 for each additional you want.
PM me with what esc you've got (or think you'll get) and I'll explain how to run the wiring and make your car 1s-happy.
Scottrik