Hi Cirillo,
Firstly we have a bit of an issue to deal with regarding your avatar that you've just instigated. I must ask you if you can change it as another member here in Adelaide already has that one in use. I know you probably like it as that's why you've chosen it but it's a case of first in first serve. I'm sure you'll understand.
Now on to your post, there are a few places where catchers can be sourced from but they are all non genuine and they are all around the $180 mark regardless of what size they are. There are no genuine ones available anymore. Also it depends on how closer match to the original you want eg. edge rolling, profile and general closeness to the genuine item.
Steve is the chap you are referring to down on Research Road. He's superb and does all my work for me and I always recommend him to any new customers here in Adelaide.
Now as far as Santa Ana and Windsor Green are concerned they are pretty much a much of a muchness. Windsor Green is just a marketing variant of Santa Ana and I really can't see anything in it. One of my neighbours has it and he claims my SA couch is far greener than his WG variant.
I'm not sure who you intend to purchase your lawn from but I've found Garden Grove to be the cheapest at around $8.80 per square metre in a roll of around 2.1 long when unrolled. Their grass is Santa Ana and it's from one of the Langhorne Creek lawn farms. I've cut mine into sods and planted it but it's too late this season to be doing that now. The only option is to buy it in full roll out form which makes it far more expensive.
If you want to speak to me direct I'm OK with that, but PM me with your number and I'll give you a call and we can discuss much further in depth.
Cheers,
BB