We crossed the Mekong from Thailand at Nong Khai, and then made our way from Vientiane to Vang Vieng, Luang Prabang, Nong Khiaw, and then to Muang Ngoi. The photos cover the 30 days or so we spent in these places. We then made the long slog from there to Sapa, Vietnam, via Dien Bien Phu, but there are no photos here of that rough and not-recommended journey.
On average, the two of us spent a total of about $30 USD per day and we felt quite comfortable. That is roughly the same as what we were spending in Thailand.