For anyone interested in 4.5GHz - 4.8GHz C band LNB's there is a supplier on Ali Baba selling them for $16 USD each excluding shipping, minimum order of 10.
4.5-4.8ghz C Band Lnb With Ce&rohs And Oem&odm - Buy C Band Lnb,4.5-4.8ghz C Band Lnb,4.5-4.8 C Band Lnb Product on Alibaba.com
4.5-4.8ghz C Band Lnb With Ce&rohs And Oem&odm - Buy C Band Lnb,4.5-4.8ghz C Band Lnb,4.5-4.8 C Band Lnb Product on Alibaba.com