we use minksheen shampoo(not found at wal mart) but we use conditioner on her and make sure to rinse her real well.. sometimes we use the pantene conditioner and im sure you'll find this there!
also.. try using a leave in spray detangler.. not sure which one you would buy there.. but you'll find somethin'(i would recommend a human leave in cond, if you are buying it from wal mart
). Oh and we have a couple different brushes for Avie.. but you can get a slicker brush there.. that is good for tangles/matts!
good luck!
alot of really great grooming products you will find online.. and they arent much more than the ones found at petco/petsmart..but you can also try one of those stores as well.. you will probably have a bigger variety!