Another option is the tents made for indoor growing of plants... But they do tend to have silvered interior material which might be a problem.
If you can wait a bit, as mentioned, Ilford are supposed to be selling some soon so it may be worth waiting to see what they come up with, but I do not imagine they will be cheap - certainly not as cheap as the ebay indoor growing tents (tho' with the Ilford tents, you are less likely to find yourself on a police list somewhere
).