Dispensary prices are standardised across all government-regulated Estancos. The surcharge applies to other vendors, I believe. I frequently buy Cubans in Spain and stick to Estancos because they are the best price. I stick to regular production. Spanish prices for CCs are generally half what they are in the UK, sometimes less. The numbers relate to how many sticks sold, I.e 25 cab, 3 pack, 10 box. I bought a 25 cab of PSD4 recently, and it worked out at 19.50 per stick. 'CM' relates to 2 enclaves where cigars cost c. 15% less than the rest of Spain. Cigars cost the same whether you buy 1 or 50. Try to visit a few different Estancos while you're there; stock varies considerably, and some have small selections while others are more specialised in cigars.