I think you'll have trouble at that price. $75 Australian is just over £42 sterling; the cheapest I can find any Thorn fixtures on UK eBay is £60 + £12 shipping for a
top-entry Beta 5.
For lamps, you're looking at a minimum of £15 for a used 35W, new ones start at double that at a minimum.
With respect, I think you are going to have to be prepared to pay a little more.