I haven't used a cushion foundation in ages, mostly because it's very rare to find a formula to my liking that's also a color match for anyone who's deeper than an NC15 skintone. Most cushions in the universal #23 shade tend to fall between a neutral NC20 to NC23.
I decided to wait a few (years?) for cushion foundations to gain traction and expand into deeper shades for a more global customer base. Luckily, I've seen this expansion in U.S. markets, and now (mostly) everyone can enjoy a portable base product.
I purchased the HERA UV Mist Cushion Ultra Moisture (SPF 34/PA++) (~$45) on Ebay in shade #23 Beige, and it's the very first cushion that is solidly NC30. Amazing! I had some reservations about the formula being too moisturizing for the summer heat, but it's the best one I've tried thus far.