Punjabi & Hindi is what I would speak with my kids most of the time (since birth). They should know the language, they'll do fine with English because they need it here and can learn it themselves when they get to school. I did fine and they'll also be fine.
As for reading/writing those I'm not...
http://headphones.com.au/pbrowse?catID=1&sort=price
The cheapest they seem to have is $37ish, maybe spend a little more (than your $30 budget) and get something good, shipping is free too and the place does have a good rep.
Does that taro ice tea / others - from those tea shops ( easy way?) taste nice? My friend drinks it alot and I've never really had the courage to buy it since I've never really had tea before :/
I dont know if you've seen this or not, but here's a thread full of delicious notes etc... (most I'm assuming are for year 10) and I did a big cleanup on this a couple of weeks ago too so most notes appear on the front page (which they do)...
Some ALDI stores might have some in stock, if it isn't popular they dont really get sold.
The ones I linked are in stores, just have to call them up and travel a bit (to the store, depending on how far you live).