Source:
strida.hk/forum/viewtopic.php?t=671
Left: Normal-Sized Strida
Right: “Mini-Strida”
“Mini-Strida”
Selling Prices of Stridas in Taiwan:
5.0 NT$14800
5.1 NT$19800
Mini NT$16xxx 
Where to buy the bike in Taiwan?
The Strida 5.0 is no longer available in Taiwan now.
They have Strida 5.1 and Strida Mini 4.1 selling in Taiwan:
strida.com.tw/tw/products/
You can buy the bike from the dealers in Taiwan:
strida.com.tw/tw/distributor/
Or you can buy it online from here:
addone.tw
What are the differences between 5.0 and 5.1? Is the 5-spider arm crank only on the mini or is it typical for the 5.1 as well?
You can refer to this thread on the forum: 
Oh, yeah, I forgot most of the improvements are cosmetic. I’ve already upgraded my 5.0 with the kickstand, alloy rack and saddle bag but I haven’t changed the grips, pedals and wheels so I guess I now have a Strida 5.05
I’m guessing the five-arm spider is only on the mini.
Yes, you’re right.