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https://steadyrack.com/product/fat-rack/?v=79cba1185463
just found it a bit cheaper but still out of my price range as I need two
http://www.wiggle.co.uk/steadyrack-classic-cycle-rack/
I'm sure I bought them individually for pennies, and they used to be red. But you need 2x of the big hooks in this pack (there's probably 2 in the pack).
Put them in the wall about 3" above/below each other, preferably angled together, or bend them. Duck tape the hook parts together.
http://www.diy.com/departments/crawford-steel-hooks-assortment-pack-of-20/192659_BQ.prd
Wiggle one is not a fat/plus one found a used one on eBay for 35!
I used large steel ladder brackets for the fat bikes hung in the garage. Fixed to the wall with raw bolts and cover in a foam protector. Hold 4" easily.