Could I ask who's calling? best rx promotions ** NewStar Financial Inc, a commercial financecompany backed by private-equity firms Corsair Capital LLC andCapital Z Partners Management LLC, is exploring a sale,Bloomberg reported on Wednesday, citing people with knowledge ofthe matter. Boston-based NewStar Financial, which provides debtfinancing solutions to middle-market businesses and commercialreal estate borrowers, is working with Credit Suisse Group AG tosolicit offers, Bloomberg said, citing a source.