356CL is a much better/more desirable board then the 356N
The 356N successor the 356N MKII is a much superior board
The 356CL is considered to be the best board by some unless you prefer tactile switches then you're looking at the 356N or 356N MKII
Rarely do they go on sale, most of the time it's trades or bulk sale as in purchase a huge premade package including the 356CL and a bunch of other crap but you're likely buying it just for the one board