Yes. Furs.
Through the end of the Russian era, the principal product of Russian America (Alaska) was the fur trade. Of paramount value were sea otters, and the Russian-American Company traveled across the Pacific Ocean in pursuit of these otters, ranging as far as southern California to find them.
The sea otter trade was a largely triangular trade. Furs from Russia were sold in China, where proceeds purchased Chinese products including porcelain and fine luxuries. These were then shipped back to Russia (or Europe at large), where they were sold for large profits. Some of these profits were then put back into the Russian-American company, paying expenses incurred in Alaska.
The triangular trade wasn't an exclusively Russian thing. British, French and particularly American traders made quite a bit of money from it. This had a lot to do with politics. Russian ships were all but barred from trading in Chinese ports, which meant furs had to travel to Okhotsk (Vladivostok was not established until the very end of the Russian period) before being transported overland to Kiahkta, the isolated trading post that was one of the few places where European-Chinese trade was allowed.
From there, Chinese goods had to travel overland the length of Russia to reach Europe. Similarly, supplies had to travel the length of Russia the opposite direction to reach Alaska, where the Russians were almost perpetually near starvation until Americans began arriving on the west coast of North America in significant numbers.
Once the Pacific Coast of North America began to be settled, supplies could come from California. Furs could also be sold in California, but transporting them to markets like New York and Philadelphia wasn't much easier than shipping them to St. Petersburg. Instead, ice was a hot seller (pun intended) in San Francisco. In the 1850s, ice harvested from the Kodiak archipelago was the largest product shipped from north to south.
And if you want to argue it, there's a case to be made that Alaska remained a colony for most of the American period as well ...
If you're interested in this topic, I recommend Russians in Alaska: 1732-1867 by Lydia Black and Ilya Vinkovetsky's Russian America: An Overseas Colony of a Continental Empire. I feel the latter is inferior to Black's work, though. For fur-specific books, try Furs and Frontiers in the Far North by John Bockstoce or Fur Traders from New England: The Boston Men in the North Pacific.