I construct and offer motorized bicycles as a hobby, I have actually constructed 8 bikes so far and understand how to do it. , if you bring me a bike I can install a motor and everything else that comes with it for $270 and that includes both parts and labor!
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Mountain bicycle, beach cruisers, and hybrids all can have a motor placed on them as long as there is room in the frame. Call or text me to pick my brain if you have any questions and/or are interested.
I purchase 2 stroke 66/80cc motor kits from gasbike.net, I have actually ordered enough from all over to know that this is the best provider for quality kits. Kits cost me $173 and the rest goes to labor for the install and to see to it everything is working right. When installed you can expect to ride around quickly at 20-25 MPH and navigate 100 MPG!
I can also set up tachometers, speedometers, mirrors, and more to deceive out your bike even more =).