My prices on H&R spacers:
DR 3mm R 635 a pair
DR 5mm R 635 a pair
DR 10mm R 1275 a pair
DR 12mm R 1370 a pair
DR 15mm R 1460 a pair
DR 20mm R 1555 a pair
DR spacers use extended bolts to attach both the wheel and the spacer. bolts are sold separately and are R39 each
DRA 20mm R 1650 a pair
DRA 25mm R 1740 a pair
DRA 30mm R 1830 a pair
DRA 35mm R 2485 a pair
DRA 40mm R 2580 a pair
DRA 45mm R 2670 a pair
DRA spacers bolt to the hub and the wheel bolts to the spacer these come with bolts for the spacer and you can use your original bolts to mount the wheels
the main advantage of these over cheaper spacers is they are light weight aluminum/magnesium alloy and they are TUV approved so they are safe...