While I agree some of these parts are still be available in USA, the value of the term "available" is open to interpretation depending on the needs of the specific Sony dvd recorder owner. If that owner desires a traditional repair by a factory-authorized service facility at a cost not exceeding that of a new recorder, they're out of luck. Sony has ceased service on their recorders in USA, as attested in any number of threads in multiple forums by crestfallen owners who cannot fathom how Sony is getting away with flouting the traditional 7 year USA repair window for consumer products. But that is in fact what Sony is doing: you can whistle up a rope, but the units cannot be repaired in a traditional, convenient manner.
To be fair, such negative repair policies regarding DVD recorders are not limited to Sony alone: Panasonic also took a walk not long ago, stranding owners of recent popular models like their trouble-prone DMR-EZ series. Panasonic owners have since been thrown to the mercies of predatory independent repair centers at exorbitant prices. A few fortunate folk manage to find this forum and get referred to our member mckinct, who has a small stockpile of parts and performs excellent Panasonic repairs at reasonable cost. Such techs are very rare when it comes to DVD recorders. The other two premium recorder brands, Pioneer and (pre-2007) Toshiba XS, tanked six years ago making it virtually impossible to get burner repairs in USA. (The most popular DVD recorder models were sold new in Canada and Europe for years longer than in USA, so repairs there are somewhat easier.)
The two most common failure points in any DVD recorder are the burner and power module. Power issues are often a generic sort of repair requiring cheap generic parts like a capacitor or two: armed with a service manual or intuition, any electronics repair tech can usually fix such a problem even in a 30 year old piece of gear. A handful of recorder models do employ proprietary ICs in their power sections, which can be much harder to replace.
But the burners are the dealbreaker: the drives for many pre-2006 models were unbelievably poor designs with the lifespan of a fruitfly (the Sony RDR-GX7 and Toshiba XS being the poster children for this). Spares are either long gone, or of the same poor quality, and if you do find a functional spare you will pay dearly for it only to have the unit fail again almost immediately. The majority of recorders contain oddball, one-off burners that were designed solely for one or two versions of that particular model: six months later, Panasonic, Sony, Pioneer and Toshiba would switch to yet another half-baked burner that would be incompatible with everything before or after. You need a Magic 8 Ball just to figure out which burner goes into which Panasonic recorder mfrd in any given year. All of this is compounded by their need for custom circuit boards or firmware chips enabling various DRM schemes to placate Hollywood.
Depending on the model, some recorders made after 2006 finally had dependable burner designs. If you are a dedicated geek who stumbles across a cache of new-old-stock proprietary Sony or Panasonic burners on eBay for the ten minutes each year someone lists them for sale at under $100, and you already have the service manuals and software and CPRM boards sitting on your workbench, you might consider those models to be "repairable." I do this myself for a variety of Pioneer recorders, but its no picnic (I wouldn't wish a Pioneer 550 aka Sony 780 burner replacement job on my worst enemy). Normal everyday consumers might prefer to find another second-hand recorder of the same brand/series on Craig's List, finish finalizing their leftover discs, then stop using DVD recorders altogether. The product is deader than dead in USA, the only fully-supported ongoing new models being the Magnavox MDR533, 535 and 537 dvd/hdd at WalMart. Here and there you might find leftover stock of new Magnavox and Toshiba DVD/VHS combos, but these are fast disappearing. DVD recorders have followed 8-track tape recorders to the "Island Of Misfit Toys" consumers decided they don't want anymore.
Some of us still love them and use them, but they're all ticking time bombs awaiting burner failure (except Super Eye's particular Sony RDR-HX780, which defies the odds with impunity
). They cannot be fixed with just a screwdriver and elbow grease like a VCR, they require complete custom electronics modules that get scarcer and pricier every day. So don't let unfinalized discs pile up: if your recorder breaks, the chances of finding a functional replacement are dwindling. Salvaging a big stack of unfinalized discs using a PC isn't easy, quick or the least bit fun.