First of all, I am not in any way affiliated with DFRobot though I did buy the Mini Player years ago. The site just surprised the hell out of me!
They have a big selection of boards and doo-dads with decent prices I didn't expect. An Uno R3 for $12.90 and Nano for $5.90 --- but I don't know what shipping costs, haven't ordered anything yet. The Gravity IO shield... I think I want one for ease of connections.
I've been wanting this cutie for some time and I think its price has decreased since the last time I saw. But I also don't know what are the shipping costs and the site requires a log-in before telling it.
I might start playing with IoT. Yes, 2 different priced Uno's makes me wonder if one comes with at least a cable or if one has a 168P in the socket. I didn't see a side by side spec.
eBay... you pays your money and takes your chances, (quoting Robert Sheckley's book, Options)