Quote from Rukuna;1205473:
Not sure, but if they do run out, you could always buy one online
Omg, that signature...
Also, from my experience, if you want any form of limited edition products(game consoles, anime figures, etc), you will need to pre-order if possible, or it will be sold out eventually, and then you would only be able to find it on eBay for like, twice as much or even higher depending on how long it's been.
I missed all the previous 3DS/3DS XLs that came out(Pikachu, Animal Crossing, etc), and when I searched for some of them, they had ridiculous price tags on eBay, and were sold out elsewhere.
I'm not sure how long that Yoshi one will be in stock, because it seems to vary, but if it says it is limited, then it is a good idea to try to get it soon when it comes out...
Also, I have heard of some sites that can make you custom designs on your 3DS, though I don't remember which site it was, and if you land on the wrong site and they ask you to send in your 3DS, it could be a possible scam unless it's a kit where they send you the design thingies.