Do a search on
(RF-602,RF602), and you'll see tons of listings--you may want to go with the seller
hkyongnuophotoequipment, as that's the manufacturer. You do want to get the set for your specific camera, because the cord you use for the remote shutter release capability has to fit your camera, and the flash triggers are hotshoe-specific for the wakeup function. The only real drawback is that these cannot be used with flashes that have sync voltages over 12V. Canon EXes and Nikon SBs are fine for this, but watch it with older manual flashes.
If you prefer the Cactus V4s, there's an actual storefront for them at
gadgetinifity.com. Either one of them will be coming from Hong Kong.
These triggers DO NOT DO e-TTL.
If you have to have e-TTL, you've only got two choices at present:
RadioPopper PXs ($500 for a set, and you will
still have to have a master unit on the hotshoe, as the PXs merely bridge the IR signals over radio), or the
PocketWizard TTL units ($400 for a set, no on-hotshoe master required, but ratios/levels settings not possible without one).
There's a rumor that yongnuo is working on e-TTL capable triggers, but the chances are very good that they will only work as a sort of radio-based eTTL sync cable. So, high-speed sync, and automatic power-setting to the flash, but no remote commanding capabilities, as there will be no master unit to sent the "orders". And right now, it's just vaporware. The only other "cheap" eBay eTTL triggers that were seen were being auctioned on eBay at around $140 per set, and apparently only had about a 40% successful fire rate, so nobody's taking them seriously. But same kind of faking-a-cable function.