I don't know where you are, but echanacia costs about R90 in South Africa. I could be wrong, but I'm thinking that the blocked nose sound you describe, could benefit with some steam. Run a hot shower/bath and close the doors so the bathroom can steam up and let them roam around in the steamy room for atleast 5min. This will help their blocked noses. Are they gasping for air? Wheezing or making clicking sounds? If you not sure, hold them up to your ears and try hear if their lungs are making this noise. If not, the steam in the bathroom will help the blocked noses. I would also suggest a good cage clean up with some vinegar which is safe mixed with warm water. A cage clean up will help get rid of any dust, etc.