The Northern Lights experience has become heavily commodified and the budget approach is genuinely better for actually seeing them.

The expensive version: a Northern Lights tour from Tromsø, Rovaniemi, or Reykjavik for $100-200 per person. You get a bus, a guide, maybe warm clothes rental, and a chase operation that drives around looking for a gap in the clouds.

The budget version: rent a car (split among 3-4 people) and do your own chasing. The forecasting tools (SpaceWeatherLive.com, Yr.no for Norwegian cloud cover) are free. Drive away from city lights to a dark area. The forecast tells you roughly where and when.

The cheapest base for Northern Lights: Norway is the gold standard for viewing (clear darkness windows, accessible) but expensive. Consider Finnish Lapland (Saariselkä) — accommodation is cheaper, the forest scenery is beautiful, and the lakes provide perfect reflection shots. Alternatively: the Lofoten Islands in Norway during September-March have extraordinary scenery and the lights appear frequently. Accommodation in off-season is significantly cheaper than peak.

Reality check: the Northern Lights are weather-dependent and not guaranteed. Plan a trip long enough (7+ days minimum) that you have multiple windows for a clear night. One-night 'Northern Lights tours' have a low success rate and high price.