OEM Receiver Boards (1-2 cm)
These GPS receivers are intended to be incorporated into other devices. You can't buy them at the local store, but you can order them online from the manufacturer or a special distributor. They are raw circuit boards. You have to provide power, a USB
interface, and a box. You might have to solder cables. (Note that Kinematic can currently only do 20-50cm positions.)
*u-blox Antaris and *Antaris LEA-4T. (The "T" is important.)
Superstar II with the right options.
Allstar, a discontinued version of Superstar
Motorola Oncore, an older receiver.
Some of these receivers give 5 or 10 Hz updates, which would be very useful for dynamic situations (say monitoring a race car or guiding a model aircraft).
"Raw" Consumer Grade Receivers (20-50cm)
Consumer grade receivers are widely available, often at a very low price. Most are complete and ready-to-use, although some are boards intended for the consumer market. While these receivers provide phase measurements, the measurements are generally not good enough to calculate a "fixed" solution. Still, they can be coaxed into providing good "float" positions at a very low cost.
*Sirf II. (Note: Sirf III does not provide carrier phase.)
Other Garmin units. There is a free Garmin-->Rinex converter available.
*Trimble Lassen IQ. Does not provide phase, but the Doppler measurement can be integrated to provide "phase-like" information. (to be verified)