QBP (Surly's parent company) makes a 130 spaced rear wheel, which would probably be close enough with some washers. $160 msrp available through any shop with a QBP account. Part number is WE2859. Unfortunately they are out of stock right now, but you can also have your shop order a custom built wheel through QBP, using a Surly Ultra New hub with 135mm spacing (70$ msrp). Or you can ask your shop to do it for you. Either way, it's pretty easy.

If you want to have QBP build your wheel, but don't have a local shop you want to deal with, you could try calling Harris Cyclery, they should be able to spec and price one for you and have it shipped to you.