Depending one hwere you are camping you may not have to spend as much as $1000.
Like Ozzycamperboy I also have an ice box (82ltr cost $180 ... sorry Ozy) and as I mainly keep to cravan parks where there is elctricity I carry a 90lts Bar Fridge.
Everything goes into the icebox at home and when we get to the caravan site most perishable go from the ice box to the bar fridge.
Also, most iceboxes will keep perishable quite cool for u to 5-7 days ... it just depends on the outside temp. and how often you can fill it up with ice.
Hope this helps.