Matsui racks you normally would need a Group Buy for (or if you're buying Matsui chips it comes with them). You can put up a wanted ad for them, but might not get much luck.
Apache racks have been sold out, but if you contact Apache they might tell you when the next shipment is coming.
They are great for an Apache (different Apache) 3800 case. The racks interlock when stacked. You can get 2 levels in an 3800 which should hold 800 chips.
With that said, maybe you're out of luck on these of Apache doesn't have stock coming in. In which case, the next question is what kind of chips you'll be storing. The Chipco racks that BRPro sells hold many different types of chips rather snugly. They would also fit fine in an Apache case.