Diving in La Palma is due to the intense competition really very cheap
Here is a typical list price of one provider.
It certainly is not worth it to make the decision for a dive from the price-dependent. While efforts are being made constantly bait, but on closer inspection, then comes out on Soch everything's the same.
Do not book well in advance, check out the site at first base!
Find out for sure on the cost of insurance charges and any excursions
Consider also, if you do not already prepare at home in terms of insurance and certificate.
Also, the medical examination costs at La Palma something, though usually much wneiger than in Germany. Conveniently this is where the La Palma Diving Center, the Centro Medico is directly opposite and provide the certificate within minutes.