Off Topic · Need some help Ques. about MS Windows 7 Product online (page 1)

I am looking for info on Windows 7 Product,
specifically Windows 7 home basic product keys.

I know alot of sites has prod keys for sale & ship
they have as much of non-microsoft websites selling keys (1 per pc) as they have microsoft sites

Question is are the non-microsoft sites such as "Cheap keys" are they legit to purchase ?
or do they actually work ?

That is feedback I seek since Microsoft sites are expensive for everything Windows 7
thanks

DJ