For many months purchasing filament from the USA Bambu Lab website has been impossible. I visited Canada’s site and there is plenty of stock. It seems like BBL’s has cut us off. Obviously due to the tariffs.
…or here’s a really wild theory: There are more people living in the USA, so demand is significantly higher. As a result, it sold out even faster. Also, there was a sale at the Bambu Shop not that long ago. A lot of people stocked up again.
In fact, it’s more like the supply situation is pretty bad at every warehouse worldwide. Take a look around the forum - there are threads on this topic from all regions of the world. 
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I discovered my local Best Buy carries Bambu Lab, Their own brand, and another brand of filaments. I have an over abundance of colors now so I’m buying as needed. But there may be other sources of filaments available.
When I have ordered online from Bambu Labs it seems the order gets fulfilled in a wide array of locations at times. My last few were fulfilled right here in Los Angeles. So the shipping was quite fast, too. Which I appreciate. (I hate waiting on shipments)
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Bambu always struggles to keep stock. This has nothing to do with tariffs.
Make an order with Polymaker.