Bushes only available as poly-bush, at greater than complete new part cost.
If you do not want poly-bushes:-
Look on e-bay for good used/new parts.
Two types available, fixed length, or adjustable.
If replacing with fixed length, buy the pair from the same car.
If buying an adjustable rod, measure your old one first, and set up the new one the same, then take it in for rear wheel tracking.
Peter