If Cherry stabilizers will do....
Mouser has the 8 unit spacebar stabilizer for PCB mount at $.96 a piece. I'd rather they carry the small key size so there would be fewer wires to cut/bend if I were to buy all the same size and modify them.
Jameco has the small size for $.85 ea multiples of 5 only (hey, 5 stabilized keys on a tenkeyless) $10 min order, 4wk lead time.
onlinecomponents.com has the small size for $.58 ea, 1x8 for $1.43ea, $15 min order. No lead time (for now).