As the supply of Snorkel Parkas on eBay has started to run thin (unless you're willing to pay a lot of money), I've decided to be a little more DIY about it. Old Navy has a blue snorkel jacket which looks pretty similar:
Clothes for women, men, kids and baby | Old Navy
I just got mine for $35 as part of last week's sale, but there are tons of coupons you can use online as well. It runs a little small (I had to go a size up), but it's not bulky or heavy, so it'll be perfect for Halloween. It's missing the orange liner and fur hood trim, so I'm thinking I'll use the money I saved on this cheaper jacket to tackle those issues myself.
I found similar faux fur trim here (which shouldn't be too hard to add to the hood):
50Mm "Faux Fur" Cordedge
I'm not sure if I'm going to bother taking on the orange quilted jacket liner, as that might take a lot of effort for minimal payoff, but if anyone has any suggestions, I'm all ears.
Additionally, you can get the patch on etsy here, but be quick because there aren't a lot left:
XMen Emblem Iron On Patch by JoJoCustomizes on Etsy
Hope this is helpful, since the original jacket are getting rarer and more expensive as people try to make SP costumes. Now I'm just waiting on that second run of SP heart shirts.