In this internet age, it is possible to buy from a Bricks and Mortar Shop far from where you live.
Propel in Brooklyn NY and
San Diego Fly Rides are great sellers of quality bikes that ship all over the USA. They both have very knowledgeable staff, offer free shipping in the US and have a great inventory of quality bikes.
It seems that the market for hub driven e-bikes is dominated by mail order, or internet based sales with no local service. This makes it tough for bricks and mortar bike shops to compete as the tight margins will not support a retail establishment with on-staff mechanics and warranty service.
Most of the older, tested and respected brands like Trek, Specialized, Bulls, Haibike, Giant, Raleigh, Cube offer mid drive bikes rather hub driven bikes.
It boils down to what you want and what you value. If lowest price is primary for you, buy on line and take your chances on reliability and service. If you are a good mechanic this will reduce your risk of ending up paying as much or more than buying local.
If you value expert advice, good warranty service, the opportunity to test ride, supporting local business, then you will have to step up and pay more at a LBS.
In the Northwest we are blessed with many ebike shops.
Seattle has several knowledgeable ebike dealers. Before I bought my first ebike I spent two full days learning and test riding.
Seattle Folding and Electric Bike 22 years in business - huge selection - many brands - Specialized - EMotion - Stromer - Blix - Wallerang - Vintage - Faraday - Giant Orbea
G & O Family Cyclery Smart, friendly, patient, wide selection - Riese & Muller - Escta Cycle - Yuba - Tern - Bullit - Kalkhoff
Seattle Electric Bike - Bulls - Dube - Felt - Raleigh - Magnum - Kalkhoff - Haibike - Tern
Seattle E-Bike - Urban Arrow - Wallerang - Blix - Easy Motion - E-Prodigy - Stromer
In addition Rad Power Bikes headquarters are in Seattle with a showroom.
Portland has quite a few as does Vancouver in Canada