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I've been looking to pick up a jokearo weapon smith for 6 months or so, sadly, they haven't been available on the GW store or in my LGS forever, are they gone for good? Should i just be getting a proxy model until then?

I would proxy and keep my fingers crossed. You that fond of the orange space monkey? look around for proxy ideas till you find him. Tau earth caste, freebooter ork, tec priest. Or good old eBay could get you what you need.

I bought two about 2 weeks ago... from the UK store. I guess there are some things they don't ship to Canada?

Fairly sure they actually do them specifically for an order, rather than have them "in stock" so to speak.

They are still available in the Netherlands and most other places.
The Canadian page lists it as 'temporarily out of stock', so that is what it means. They will come back, it just might take a while until Canada gets a new shipment again. 6 months is really long though.
You could try checking some webstores.