Just got mine from ebay this week. I'm a size 12, in 2.0,3.0,4.0. 1.0 I'm a size 12.5
For these, i got a size 12 and they are snug, but i dont mind them. I wear them without the insole which makes them a little bigger. I would probably go with a 12.5 if i had a chance.
I already had a groupon account so I bought 1 their and I made an account for Living social. FYI use two different internet browsers if you are buying from living social.
I have not personally tried yet, but I have heard stacking the multiple gift cards and coupons worked.
Also, try using a different CC and email for each website.
Here is where I got the info.
Buy $35 ADC gift card and get $15 discount code for ADC
Bought two for $70 value and got $30 fo free. Value of $100 in total
https://www.livingsocial.com/browse/chicago?lat=41.88&lng=-87.624&query=adidas&address=Chicago&division=chicago&locale=en_US
https://www.groupon.com/deals/n-adidas-2