Norway is not a country ...it's a planet ..tons of places depends on ur interests (nature parks..water activities..geologic tours ,..tours to the Arctic ..etc ) and the season u r visiting ,,,budget r u staying in Oslo or exploring other places?? Do ur search and explore the country on the web to decide what u prefer..cities and tours you'll do .. most tourists stay in Oslo..others go beyond ,,,budget depends on flight tickets ,,r u staying in hostel or 3 or 4 star hotel..duration of ur stay ..a week or a month ?check prices in booking and hostel world ..and sky scanner for the cheapest month to get a flight ...Good luck and safe trip /The Top 10 Things to Do in Norway 2017 - Must See Attractions in Norway | TripAdvisor
If u r on the budget side u can compare accommodation prices in a hostel to airbnb >>> f u found results same u might choose airbnb because u can cater for ur meals so u wont eat out a lot prices r so high ..f u chose a hostel fine u can buy fruits ,bread , vegetables ,tuna,smoked salmon at Mira 1000 and Kiwi groceries, ,,they sell cheaper than other stores, ,they r every where n Norway and prepare snacks at the hostel,, use tap water it's very clean to drink>>>f u decide to go on hiking or camping trips take ur thermos with hot drink and snacks,,,,there r some budget cafes where u can grab a snack check the link....safe trip /Cheap restaurants and cafés - Oslo on a budget - Your Oslo - visitoslo.com