In order to purchase liquid nitrogen from this store, what type of container must I have? Is a insulated cooler fine as well?

You must have a cryogenics liquid Dewar. Look on Amazon for prices.

If you bring one of these in we will be able to fill it while you wait http://www.chartindustries.com/Life-Sciences/Aluminum-Dewars/MVE-Lab-Series

Abdurrahman yes like Wesley said you need a dewar. You can find them in 10, 15 20 or 30 liter sizes depending on what you need. Has to be insulated dewar. Call the store first to find out exactly what you can or cannot use.