Have a lot of pot lights inside and out that take PAR 20 bulbs. Used to be able to buy 10 packs at Costco or Rona but was told they had been discontinued (bulk packs). I probably have to replace one a month (most fixtures have been in place 2-3 years). I can buy singles at grossly over inflated prices. Does anyone know of a reasonable source or do I have to convert them?