I bought mine from ths chap on eBay:
nicholas2528
It was well made and arrived quckly. He seems to go through phase of selling batches of several then none for a while, could be worth enquiring if he is going to sell anymore.
Link to roll bar on eBay that I bought from him::
Haynes roll bar on eBay
Interestingly, it says two available and one sold, has he still got one that wasn't sold?
I bought it back in June so this link will only be useful for another month or so.
It was £95.00 + £25.00 p & p
If there were were several fourm members who wanted to one, maybe nicholas2528 could be persuaded to make/sell some more?
Hope this is of help.