There's some pyxies (giant African bullfrogs) going and I highly recommend them!! Marc staniszewski (legend) that owns dart frog.co.uk is selling grown on juveniles for £90. Yes this is steep, but the amount of money for feeding you'll have saved makes them worthwhile and they can live up to 40 years and reach a large size. They're also more active hunters. Otherwise, reptilecentre are a good shop and should sell some horned frogs or exotic pets also are good. The pyxies will require similar but larger housing but I can advise you to my knowledge and what I've done, in what to get. Their care is otherwise the same and featured in that book