I've had posts talking about and analyzing the Science and Motion Puttlab software (aka SAM Puttlab). The SAM Puttlabs are not affordable for most golfers, going for about $8-10K for the software (when I win the lottery, I'll be sure to get one).
However, there's a solid alternative to SAM Puttlab software that is affordable called the TOMI Putting System. The local PGA Tour Superstore from my home is selling TOMI for $199. Here's some promotional videos for TOMI:
I'd still suggest looking for an instructor who utilizes the SAM Puttlab software because it's more elaborate and measures 3 x's more parameters of the putting stroke, but if you cannot find an instructor near you with the SAM Puttlab software then this is an excellent alternative.