Padron 2000 can be had for about $4.00.
CAO Gold, Oliva Serie 'G', Punch Rothschild Oscuro, Hoyo De Monterrey (all NCs) are usually around $3-5 apiece.
Flor De Oliva, Indian Tabac, and Sancho Panza can be had for even cheaper, usually somewhere between $30-50 a bundle/box.