How about paying $30 for a CD-sized disc able to store 25GB per side? Yes, Sony has just announced the release of single-layer BD-R ($30) and BR-RE ($36) this month in Europe. Discs run at 2x speeds and have a data transfer rate of 72Mbps.
“The two media are sprayed with a scratch-resistant, anti-static coating – handy, given how thin the data layer is on a BD. Sony said its own tests forecast a lifespan of 30 years for both types of disc.”