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Not a special price, admittedly, but I thought I would post about these cables as I use them quite a bit for plugging the kids toys into the wall rather than using batteries (works well for Hot Wheels toys). The 5.5 x 2.1 mm jack will fit most 3 and 6 volt adapters.
For example, I use the 3 volt adapter I got with my Lacrosse battery charger to power a Scalextric that would normally take two D cells. The current rating is not quite high enough but it still gets the job done okay.
Doesn't include an AU power adapter