It shouldn't be too hard to find. I got my copy off Amazon. Searching Amazon.com for "Helmet of Horror" brings up four different copies. By all means, do follow that need; I love this book to bits and I hope you do too :)

I just ... buy a lot of books, really. I've got three shelf-loads of unread books at the moment. That said, about half the books I've reviewed here are ones I borrowed from my housemate Rath.