hello i m selling links for my 2 PR4 sites

both have avg 2500uniques per day.and have about 50-60% traffic from USA
.here are the stats screenshots

sitename :- ansari4u.com
alexa rank 124000
Google pr = 4
daily users :- 2300-2600
daily page impressions :- 50,000



site name :- Mobile420.com
google pr :- 4
site daily users :- 2400-2700
Alexa rank :- 67,077
daily page impressions :- 120000



if you want to place link on both sites then will cost you
15$/month
and if you want to place link on one site then will cost 10$/month
for one site

Thanks
Kind regards