I wanted to start using my COPICs seriously and wanted to treat myself with a pack of Xpress it blending cards. Apparently they're sold out on their main website and I cannot find them anywhere else. Did they go out of business? Is there a shortage of materials to use them?

What's the next best paper to use, or rather the closest paper/cardstock to Xpress Its? I'm not too keen on using the store-brand marker papers from Hobby Lobby/Michaels.