Looking for guide recommendations in Colombia

I’m leaving for Colombia in 3 weeks and would like to introduce my girlfriend to mountaineering in Parque Los Nevados. There’s an “easy” one called Nevado Santa Isabel. As usual, the prices I’m finding with google are super expensive and I know I will be able to find much cheaper once I get to Colombia. I’m trying to prepare in advance so I was wondering if anyone knows of a guide I could contact through WhatsApp. Thanks 🤙