B&H shows 220 Portra color in stock, I just checked. You really have to want it, it sells for a premium over the cost of two 120 rolls. There's no 220 black-and-white still being manufactured anywhere as far as I know. I wish there were, it would relieve the tyranny of the 10-exposure (for 6x7) roll.
If you can find one, Nikor made a tank for 220. I believe the tank is the same one used for 4x5, wider than the standard one for 120/35mm, and they made special stainless reels for 220 that fit the larger-diameter tank. I think I still have a couple of those reels. I should probably sell them while it might still be possible.
You could also send it to Praus Productions in Rochester, NY. That's where I send my E6. He just did some 220 Provia for me a couple of weeks ago, I still have a bunch of past-date rolls in the freezer. He also does C41 and B&W processing.