Sure ... if you want no support, no guarantee of Mac compatibility and a restocking charge if you want a refund. If you feel lucky, you may save $10.
I recommend that you deal with a reputable seller who knows Macs and guarantees compatibility, offers a lifetime warranty and a no cost return or exchange if it doesn't work.
The most-often recommended dealers on MR for US customers are Crucial (link above), OWC /MacSales.com and
Data Memory Systems
Thanks
Trevor
CanadaRAM.com