many unable to buy test kids in stores are extending around blocks. very from you traded. i ve been looking for a test all week, actually, for a few days now. all of the cvss near hi are out, they don t expect any until friday. reporter: the demand is so high that cvs, walmart, walgreens are limiting the number of kits that customers can buy. many simply can t find them at all. we searched around. everything is full because of the holidays. reporter: compounding the problem, many are confused for what kind of test to get. it s confusing what i need to get. there s three big categories of tests. within each of thought categories there s a bunch of different manufacturers, a bunch