Walmart's cheap seeds

Walking around a Wal-Mart the other day (believe me, I don't often shop there, but they sell cheap CFLs), I noticed that they sell really inexpensive seeds. Their house brand was $.10-$.30 and equivalent quantities would go for much higher in other locations I've purchased seeds before.

Anybody ever used these seeds? Do you think there's something wrong with them that they come this cheap? Or are these just economies of scale at work?

The best seeds money can buy are still freaky cheap.  Even at $3 for a packet you usually get far more seeds than you can possibly use in a year.

The walmart stuff might be a year old, and it is probably GMO seed.  I would avoid it. Get a catalog from "Johnny's selected Seeds". 

And for cherry tomato, get "Matt's Wild Cherry".

Great - thanks for the advice!