Very often they can order in. Before you order you can look at similar models in the same brand, or different sizes of the same model (which isn't quite the same as seeing the exact model, but better than not seeing anything at all), or they might even order for you to have a look.
the one we go is tiny, packed with stock, does repairs and - best of all - rather than saying like the big places, 'We will deliver tomorrow week between 8am and 6pm, the person behind the counter will say, 'Oooh, let me see, not tomorrow but the day after, afternoon alright? Mike will phone at lunchtime to give you a more precise time, that okay?'
And Mike duly phones and says, '3 alright? You need to pick the kids up.... Well, I could do it on the way back, won't be till almost five though.'
Absolute game changer when you have dogs to walk or DC to collect to from school.