its all part of the hobby you build an airframe from a kit or scratch build. its the same with an engine ..... cheaper... sometimes yes sometimes no. satisfaction from flying what you salvaged from a weedy or a chainsaw...priceless.
i got my first g62 from B&B all my other engines were home built from 25cc homelites to 100cc husky saw engines. some of the husky engines can use the g62 prop hub for easy ign conversions