3-wheeler - adult trike?

[DTisme]

Anyone know where I can find a 3-wheeler for adults? I don't feel safe on the gravel roads, but I want to ride! Target & Walmart = no go - on floor anyway -- walmart.com says Hilo store has one but you have to ask for it (i.e., it's not assembled). I put a bike together years ago and swore I'd never do it again. SO - local bike stores -- are there any that don't charge an arm and a leg?