I have two strains, nannochloropsis and tetraselmis. The price is $4 a bottle, each bottle is half a liter and is loaded with live plankton. I currently have two bottles of tetraselmis and four bottles of nannochloropsis. Shipping is $5 for up to two bottles, and $10 for more that two bottles.
Get a culture kit for $40, two liter bottle full of a strain of your choice, 4' of airline and an air stone, as well as culturing directions. Ill include a 2 bulb 24" t5 fixture and an air pump for $100.