I used the code X8YZF10 to get $15 off (I just found the code online on the forbes website).
The white version is $150 cheaper then the black version (which is on sale for $499) - AFAIK this the only difference is the colour.
I've never used a Theragun product before (only cheaper massage gun from a different brand) so I have no idea about how good they are.
One word of warning is that I have seen some reviews of people saying the battery was DOA (although it seems you can return it to get a replacement) - not sure if it's an ongoing issue but I just thought I'd mention it
I haven’t found much scientific evidence about benefits percussive massage guns (fascia guns) over placebo or stretching. Some benefits with increase range of motion prior to exercise but nothing substantial to indicate improved recovery times or injury prevention.
Anecdotally some people swear by it but that’s a lot of money just to take a persons word.