This is a possible alternative, although it's not a linen board (which would be my personal preference). The production value looks to be very good, and it appears to be hard-wearing. However, it may not conform to USCF standards as regards square colours. https://www.ebay.com/itm/Superb-Large-Printed-Folding-Chess-Board-based-on-Antique-design-with-2-squares/162989291818?hash=item25f2eb392a:g:n6MAAOSwcUBYMwrt
Folding tournament board

I want to ask about an unusual new type of board I remember seeing in ads about a year ago. It's not a folding board -- it's made up of 4 separate square pieces of wood that snap together with magnets along the edges to form a normal size full board (and about 1 inch thick). When disassembled, the 4 square quarter-sections stack vertically to form a cube shape for storage/transport. I liked it, but I remember that I balked at the high price. Maybe the price has decreased by now. Anyone remember what it's called or who makes or sells it?
@Entheon:
Could be one of Colorado Woodworker's "Tower Series" boards:
https://www.etsy.com/shop/ColoradoWoodWorker?section_id=19547955
It could also be this board, but this one is far more expensive and simultaneously looks less attractive:

@CatoWeeksbooth, yes that's it. I must have seen the HOS version, which is still much too expensive at $400 . I agree that the alternative version from ColoradoWoodWorker looks better. And is much more reasonable at about $140. Cool idea, I'm tempted. Thanks for your quick help!
I loved those HOS single fold linen/particle boards. I have three of them with 2.25" and I did buy one of them from HOS with 1.75" squares when they offered them on clearance.