Hello FarmerG, Welcome to Motorbicycling.com glad you joined us.
If you are looking to buy a complete bike try making a "Wanted to buy" post in the Swap And Shop - Motorized Bicycle: Engine Kit Forum
forum. And take a read of the other post in the swap shop there might be someone offering a complete bike for sale.
Many vendors offer complete bikes as well, check out some of the sponsors of the forum.
Keep us posted on what you decide and if you change your mind on building one, you have came to the right place. We have awesome members that are willing to help you out with any advice you may need.