They're probably designed to bend (i.e. somewhat ductile) as you'd certainly want them to bend rather than fracture in an impact as you describe... anyway I had priced them out maybe 3-4 years ago and they weren't expensive at that time; my '84 roccet needed a major rear brake service and the axles were a little scored due to bearings having run dry, with the result that there was a little play in the wheels even with the bearings tight. A quick search shows they are still available at $70 ea. from parts4vws.com - there might be a cheaper price out there but I usually start my search there for non-performance items because back when I was driving VWs regularly their service was always excellent (and I assume it still is. Since the girlie and I are buying a house together, it looks like I will be dusting off the old VW-wrenching skills again, since she'll be bringing her G60 with her.)
nate