The glowfuel Nexstar comes with an OS46fxi engine. That's about $100 worth of engine. A fuel tank is about $10.

The electric Nexstar has a $73 outrunner, a $100 ESC to control it, and $150 worth of NiMH batteries and charger. That's about $323 worth of power system. And doesn't use LiPo batteries that are lighter and have greater capacity. LiPOs that you might use with that motor would be around $75 each, and a charger with the technology to charge them would cost from ~$50 to over $150.