It's still there, for sale (this was a shop-one), but no longer has any value since all the rooms stay on the map.
Interesting minor bit: In Loop 2+, if you have the shop discount card, Credits cost 0 and therefore actually give you 1cr
edit: little extra: With enough batteries, it starts in the middle of the screen and sticks out the side. And every individual mod you add in ticks the battery line a step to the left.
I'll send a couple of screenshots, though it's extremely easy to replicate (just go to the weapon screen and add modules)