We are paying $2800 (delivered) for a 10x14 rough sawn pine shell (ordered at March's lumber prices). It will be another $600 to finish the roof (tar paper, drip edge, shingles, nails, and ridge vent), $100 for paint, $40 for two windows, $100 for hardware cloth, $20 for feeders and waterers and an egg basket, $10 for the first bag of sweet pdz.
Foundation (sand and short pieces of treated 4x4), framing for interior screen wall, roosts, poop board, shelves for supplies, nests, dust bath containers, and bedding are no cost (found things or repurposed things.)
We expect to get about a third to a half of that back when we sell the house because it will convert to a nice shed.
No run, so no cost there. And no electricity or water to the shed. And it is small enough to not need the $50 building permit from the zoning office.
I think it is better than spending a quarter as much for something that won't work well and/or won't last, and that we would have to pay (in time,effort, and hassle if not in cash) to remove so we can sell the house because it detracts from the curb appeal of the house.
Our next best option was about $3800 (delivered) for metal or T-11 sided, metal roofed shed of similar size (mid-April prices.)
Or about $1500 in materials plus cutting and hauling a lot of trees from my woods and a LOT of time to build it ourselves.