Echo skins in Earl's shop BUG?

This is a possible bug where a handful of the skins for the echo device show up for 0 eridium, well they are not free. I am unsure if anybody else has encountered this issue yet, or if it’s just me. It isn’t a huge issue but it is extremely annoying when you save up your eridium to buy skins and heads, just to get a bunch of “free” skins and then POOF you are left with no eridium. I am also new to the forums here so my apologies if this is in the wrong category.