Well in the UK we've got them for £1.99 near me, I've only bought from Toysurs and they only recently got the Series 3, I've never really looked in any other shops apart form a small one about 20 minutes walk from me and those are right by the counter. I feel for the figures I want and I'm always worried about not getting the right one but, I won't buy unless I'm fairly confident as I don't have the money to justify buying the figures I don't want, so far guessed all right out of the 6 I bought, I normally feel for a certain piece/s to identify a figure like Elvis's cape and then his hair which after feeling several Aliens convinced me I'd got the right one.
The ones I have bought I've liked all of them as figures I'd gladly get at least one more of most of them to keep one as an original and one to customise if I had more money to spare. I'm looking forward to Series 4 the figures do look a bit familiar let's face it they could be a lot more creative but, on the other hand I don't have similar figures to the ones being released so personally they'd still appeal to me enough to go out and get them, in contrast I'm really unimpressed with what I've seen of Series 5 so far.
I also think it's good that you can take them apart easily because I'm not very good with my hands at stuff like that so I think more figures which you can customise easily or a tool to help 'pop' Klickies is a good idea for kids and people like me who struggle to take figures apart although not necessarily in this format.