If there's a better way to communicate a product suggestion, please let me know. And I'm sure that Adafruit have plenty of product ideas, without me butting my fat head in, but here goes.
I came across a little board
that productizes a MAX3232 chip. Mounts it on a board, along with the requisite caps. But it's *not* very neat, nor (more importantly!) is it breadboard friendly!
OTOH, it is quite inexpensive. But I'd gladly
pay a premium for a similar board of Adafruit quality :-)