Ribtek and Tusker heads run around $15 per half dozen. Never used Ribteks but I hear they are excellent. Never heard of Tusker before, but they're in the price range.
Art.
Being from Australia and both those heads are Aussie made I have used them in the past and they are good heads but there is a better Aussie head "Outback" made by Alan Woodward (Woody)and are very affordable.
http://users.ncable.net.au/~woody/introduction_page.htm
I have 2 dozen of his Supremes coming in, 170gr
just gonna have to get some brass 50gr inserts for them
Also if you want a really cheap head and depending on shaft dia. you can use 38 or 9mmbrass, just go to a gun range and pick up some