Infusion Sets

Being new to all this Pump stuff raises a few questions. The cost of the Infusion sets, sensors etc, is verry high.....especially through Medtronic. Typical Cost for a box of 10 Sensor is around $450, even with my insurance the cost is nearly $100. I was trawling the WWW and found some sites that offered the same sets for around $150, without insurance, so theoretically I could get them even cheaper if they accepted my Insurance. Are there any generic infusion sets that fir the Paradigm 722 Pumps and if so, what are their costs. Any advice would be welcome