Standard Cost of a Diesel Pusher. Unfortunately, diesel pusher motorhomes don’t offer all these great benefits for nothing. While being one of the most desirable motorhomes on the market today, diesel pushers are known for their hefty price tags and additional maintenance costs.While used diesel pusher motorhomes tend to vary in price, a new diesel pusher can run anywhere between $150,000 and $300,000.t Kirkland RV, we have a wide selection of Class A vehicles, including many diesel pusher motorhomes. These vehicles offer many great accessories and advantages for travelers looking for space and luxury in their home away from home.