It looks like DFRobot is trying to clear some stock. Good time to get some Christmas presents.
http://www.dfrobot.com/index.php?route=product/search&search=gadgeteer&description=true&page=1
@ ianlee74 - Might be the same sale mentioned here?
https://www.ghielectronics.com/community/forum/topic?id=17173
Prices definitely look pretty good, IMO. Especially the button and potentiometer (they call it analog rotation) modules. And given that there doesn’t appear to be a potentiometer module available from GHI any more, it might be a good idea to pick one or two of those up, if you anticipate needing one.
I’m not 100% certain on compatibility, but I believe that the JST expansion module is essentially the same as the e-block expansion module that GHI used to sell, so if you have e-blocks laying around, that’s a good one to have (I already have 2).
Many of the DFRobot modules have both sockets and pinouts, so they’d be pretty easy to use with both Gadgeteer and non-Gadgeteer project.
Doh! That’s what happens when I get too far behind, give up, and hit the “clear” button 
LOL. I hear ya, buddy.
Never hurts to mention it twice, since other folks might have missed the other thread, and there are some good deals to be had.