No Collectable Minifigs in Argos until mid-May :-(
It seems I've been misinformed about the launch in Argos: Customer Services at my branch said they are not expecting them in their warehouses until 11th May so they won't be in the shops until a week or so later.
They are however appearing in branches WHS but you need to get there quickly: it seems they get just one box per branch. I went to mine this morning at 9:20 only to find somebody had beaten me to it and bought the lot earlier! I may have myself to blame for that if that person read on here about WHS selling them. So, if you were in WHS in Fareham today and you're reading this and have spare a cheerleader, get in touch!
I suspect most branches of TRU will be out of stock by now, and there's no sign of them at LEGOshop.com, so we'll just have to be a bit more patient...
Update 5th May: Apparently these are now making it into Argos stores. However, it seems most branches get one box and they are brought to you from the warehouse so you won't have an opportunity to choose using the barcodes.
I've also had it reported that one shop, maybe a German brand retail shop (I'l check my emails later), has blacked out the barcodes to prevent people picking and choosing!