"You get what you pay for" fits very nicely with this hobby.
I started out with a red sea marine kit, and I think I got it for around that with shipping.
It got me through my cycle accurately, I assume the master version is as good and it'd be a decent test kit for ongoing use.
I have a seat with foil packets that are sealed that a friend gave me from his attic (about the same time period too!).
In my experience so far, they test at about the same-ish level, but take longer then the directions state - with the ammonia reading being all over the place.
(I do so like the pool style cups they have with the color bars on the sample thing tho...bets tubes and paper!)