The smallest I've seen is 48" but these have little to no counter space. Plenty of options for that size at HD/Lowes. But in that space you should consider whether the extra sink will be more useful than the counter space. Some people want that space for bathroom toiletries but some can do without it.

Thanks for quick response. I'm trying to decide between an undermount tub and an alcove tub - I would like a custom tile front on tub but find that a Quartz tub deck (when using an undermount) very pricy. Any suggestions? Also very hard to find examples of tubs in showrooms - just pictures online which makes it difficult to decide.

No problem. Yep the undermount tubs and supplies for them are typically more expensive because they are much less common. Would you be willing to use the custom tile as the deck surface as well? Some of our customers have used tile on the front, sides, and top of undermount/drop in tubs.

Other options would be a drop-in tub or a soaking tub. The drop-in would give you the tile options you want but will have a small lip that sits on top of the decking. The soaking tub option is what we've installed the most of. They are deeper than traditional alcove tubs and a little nicer.

Sorry to hear about the showrooms. I would try calling a few local contractors to see if they have pictures, a personal showroom, or even an old project they can walk you through.

Here's a picture of a soaking tub we recently installed. It doesn't show it but the same tile is used on the floor. It isn't a drop-in but it's much nicer than your average alcove tub.