Filed under: Finance, Web BillShrink is a web service that helps you find the best deals on cellphone service, credit card accounts, and even the best gas prices. Since launching a year and a half ago as a wireless comparison engine, the BillShrink team has steadily continued adding new services. Now BillShrink has added bank accounts to its lineup.In order to find the best savings accounts and CDs, you enter the amount of cash you have saved, an estimate of how much you expect to set aside each