Should be available for the 2002. TRD still has them as well as other aftermarket sources - like Megan Racing, OBX, Ractive, WeaponR, etc. Depends if you customer is looking for a STB for looks or functional piece. I'd recommend TRD for functional - but they generally run about $160 - not sure if that is the price point you are looking at. Most ones for around the $40-$50 - are completely for looks - don't count of them for keeping the strut tops/chassis from prying apart under heavy loads.
Generally - any strut tower brace from the same generation should fit - 8th generation Corollas spanned from model years 1998 - 2002.
Have to watch vendors that get components from overseas (ie. most of them) - 2001 was the last of the previous generation and they consider the 2002 models part of the current generation Corolla. What should help is that there are enough physical changes in the body between different markets to avoid mismatching of parts - but you should get a hold of someone in person to be sure.