http://www.ammoclip.com/S/savage_62,_64,_954.htm
This place is a little cheaper and reputable. They are also fast shippers.
I see these mags at Walmart every now and then for $10. With a little searching you can also find them around $14 and I often find these mags in old magazine boxes at gun stores.
These mags are popular and often sell out quickly but they are common and with a little patience and persistance you will come across several at a reasonable price. At least that's the way it went for me when I was looking for them.