Castellano language exercise books

[peter.zion]

I'm busy learning Castellano here and I was wondering if anyone could tell me where I could find grammar exercise books such as those that might be used by schoolchildren in BsAs. I found when learning French that using such books was a great help for learning the grammar, and I imagine the same is true for Castellano. I've looked in the "regular" bookstores but I can't seem to find anything...

 

[orwellian]

I've used Uso and it's great, not sure if they have a South American version of it though.

 

[peter.zion]

Thanks orellian, I think I've seen Uso back in Canada at the language learning store. Any idea where I could find it here?