that's similar to the price of ours (in sunnynook). we pay $85 a term (but no extra charges) and we help out for 2 1/2 hrs on a Sat once a term. I actually quite enjoy helping out, as it means I get a couple of hrs 'free of ella' time during the weekend and when you are helping out you often get some of the best toys as you can grab them as soon as the members returned them.
we totally get our worth out of the toy library, as they have heaps of big toys (e.g. cars, rollarcoasters, rockers, slides etc) and over the entire summer holidays we took out a kitchen, rollarcoaster, car and dolls pram.