Sunshine island's Wonderful stones >.<

[Kawaii Erin]

Does anyone know if you have to wait untill after a specific year to buy wonderfuls from chen's shop?
I already bought the yellow, red, and blue wonderful from the start...
I assumed that its the same as in IOH, that your farming degree must have a 5 in it, and that they're only sold in the winter. But but is been 2 years and i have yet to find or earn one... WTH?!
help plz?  

[GrowingDandelion]

You can also make your own wonderfuls if you have 7 pieces of wonderful. You can win them in festivals and stuff, then bug the kid Charlie at the shop. I got a purple one which gives you money when you use the tool it's equipped on.  

[Mailen Jokerbell]

Getting wonderfuls is the most annoying part of the game.
But at least you can re-use the same wonderfuls for whatever you are using as long as charlie is on the shop.