[Re-Edit: Old link expired as of 17/1 9am, but new link still valid]
$100 and $200 denominations are available. It says you can buy up to 10. Whether that is 10 of each denomination, or 10 altogether, seems to be vague.
BIG W eGift Card is valid for 12 months from the issue date.
Since I missed out on the Entertainment Book ones, I was glad to grab these.
Hurry! Limited time offer. Must end on 1 Feb 2015 or until sold out
They only sell Myer gcs. Not Coles Myer Group gcs. As far as I know they have never stocked the Coles Myer Group gcs. WW group don't want to send customers to Coles supermarkets. Their stores sell Masters gcs but not Bunnings gcs for the same reason. However they do sell Myer gcs, as well as David Jones, JB Hifi, Good Guys, Country Road etc… These stores are not direct competitors to a core business of WW.
From experience & comments in previous threads Myer will not allow you to purchase Coles Myer Group gcs with a Myer gc. This is also listed in their t&cs:
http://retail.myergiftcards.com.au/CMS/Page/giftcardterms
"1.2 c. Gift Cards cannot be used to purchase Gift Cards or other tender;"
Sorry no way to convert a Big W gc to a Coles Myer Group gc.