I was able to find some cards at my local Walmart yesterday. They were selling blaster boxes for $10.00 each. Inside each box are 5 packs(6 cards per pack) and 1 extra pack with 3 exclusive insert cards. Like the hobby, the number of inserts in the retail boxes matched the odds. I bought 5 blaster boxes and came close to getting a base set. Still need about 20 cards or so. I was not able to complete the 10 card insert set. I have 8 of the 10 cards, with several extras.
Also, checked my local Target, but they have not stocked any of the new cards yet!