Over the past couple of years the marketplace and zshop sellars have inceasingly pushed operatic DVDs, some from America, and they're coming down in price. I bought a couple from Caiman - at the current exchange rate came to about £8 each inc airmail shipment. I don't buy so many Opera/Ballet DVDs but they inevitably come from Amazon marketplace or Play.com.
Nice situation and about 1/10 of the price of decent opera seats though they can't fill your room with operhouse atmosphere. You do get enough time to enjoy a decently long drink when you choose to have an interval.
That's the definition of a perfect interval to me - time to queue up for and actually consume a drink at the bar before the chime goes!