I've got a heat lamp/gas brooder that I have no use for so selling on. It was originally used to warm pheasant chicks and I was told it would be good for up to 1000 (!!). I never had need to use it, so can't verify that. It runs on Propane gas and is ideal for situations where you have no electricity.
I got it for chicks and turkey poults, but I'm sure it would be equally good at waming piglets, lambs etc etc....
They seem to sell new for £100+
Make me an offer.
I'll test it works properly before selling (no gas here atm) and happy to post at cost.