We've been using 3/4" white melamine particle boards to build frameless cabinet cases so far.
Recently I saw some imported cases built from grayish, fabric-like designed melamine, which is also supposed to be waterproof (see the photo bellow).
The company that sells those cases doesn't offer that material for sale, but our partners are asking us to start providing them cases like that or something similar.

Does anyone know of some similar looking 3/4" thick melamine sheets that are available domestically, possibly water resistant and case-grade quality, i.e., not very expensive?
Currently, we're paying around $35/sheet for white melamine (4' x 8').

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Uniboard, Arauco and Tafisa have similar panels I think. I'm in Canada so I'm not sure of the availability elsewhere

Your sheet goods supplier can't help?

Check Onbord as well

There are a number of linen fabric looking products for cabinets on the market. Nothing in this line is going to be cheap though. Our latest project is using Cleaf for the interiors. 7 X 9 panels, about $250.00 per sheet. Seems like a lot but about twice the square footage per panel as for a 4 X 8 panel. White melamine is about the least expensive material you can use.

Agreed with all above. Egger, Tafisa, and a bunch of others have something similar. The thing that is throwing me off is the waterproof comment?

Gary, that's exactly the main point.

I know they've been doing it in Europe fora a long time but does anyone here make such panels?

Here's the snapshot from their catalog referring to that:

To make it waterproof, it's either pur glue or hot air/laser edgebanding. All melamine can be made waterproof if you have the right edgebander.

Bozzy, that may be true for fronts, I don't think anyone would bother to edgeband all four sides of all cabinet parts in general case.
The melamine boards I am referring to have a core that is considerably more resistant to moisture then ordinary ones (if those have any resistance at all, what I doubt). I've seen raw cut pieces (non edgebanded) left on a porch for weeks and months exposed to rain and sun, and they were not ruined by water.
I think they have some greenish colored core, but not sure if that was the case in general.

We've installed over a 1000 kitchens on new high rises in the last 2 years with two different kitchen suppliers from Italy. Kitchens come knock down and we assemble them in the unit. Think of IKEA, but higher quality. Every piece is edgebanded on all 4 sides. I think that's just the standard in Europe

One of the buildings where we installed the kitchens had a flood over the new years holiday where 10 floors got flooded. And the melamine blew up around the edges because they used eva glue.

If your orders are big enough (100+ sheets), you should be able to get your melamine layed up on moisture resistant particleboard ar mdf.

Whether that's cheaper than edganding all sides of a panel with PUR, that's another story.

https://na.arauco.com/en/p/ultra-moisture-resistant-particleboard-mr-ultra-mr

We use a MDF material that is waterproof. It would be easy enough to have melamine pressed on these sheets. Cost will be an issue, un-coated sheets are $200.00 per each. I have a piece of it on my desk that has been in a jar of water for over a year without change. No swelling, nothing.