CR2354 batteries can be had for around $2.00 each at this site. I ordered 12 at 1.57 each, plus $6.52 S&H, for a total of $25.36
MOUSER is a major supplier of electronic parts, but I have no association with them, other than being a longtime customer.
http://www.mouser.com/search/ProductDetail...alkey658-CR2354
fynky