Store bought tests/ Online tests

Ok two threads in one day, I know, I'm needy. But I'm trying to help everybody out as much as I can to justify some responses to my questions. Ok so as we all know there is a Gigantic disgusting price difference between wal-greens and online test strips. $15 per at my local store as compared to a few bucks a pop on the net. My question is if there is a difference between these tests? Is the store bought version that comes in the big green box just marketed to the dumb suburban mom that thinks that thats the only way to test their kid (be an involved parent and you wont have that problem).
Or is the store bought version more expensive because it must meet more stringent demands for manufacturing, i.e. perhaps the online tests are cheap chinese made tests that wont necessarily work everytime. I know the store bought ones usually have the option to send it in to their sponsored lab if it comes positive, perhaps that is why the price is jacked. Anyone got any insight on this>?
I hate to spend 15 bucks at a store when I could order for a fraction of the price with shipping included.

The ones on ebay are very accurate and much less expensive. They worked well for me.

What site did you use to order those strips slanted? I want to find one that comes on high recommendation before I order offline.

I've bought all mine off ebay for about $1.30 each. The only different between the ones you buy on ebay and ones from retail stores is the retail store ones test for multiple drugs. You can buy ones on ebay that just test for thc.

Well the one I buy usually at wal-greens, forget the name, comes in a big green box (how appropriate, I bet half the suburban moms dont know why) and is a marijuana only test. It allows you to send the pee in if its non-negative, (like Id Ever do that!).