These two masks are called Ngils. Their design is unique to the Fang people who are spread out in South Cameroon, Equatorial Guinea and Gabon. The first mask is quite nice. The second (front view only) is beautiful, larger, and appears to be old and used. Actually, both have been made by talented professional carvers for sale to collectors. Maybe you could buy the first one for $100 and the second for $500 in this economic climate. Regardless, these two examples would look great in any collection of African traditional art.
Most of the masks you see in tourist shops, eBay, thrift shops and garage sales are not nearly this good. You shouldn’t have to pay more than $10 for them.