I bought 4g of 20x and 4g of 15x for 100 bucks with free shipping from salviaworld.com

Check the prices at www.salviaworld.com and www.salvia-supply.com for costs.

20x is the best way to go.

Unless your mind is really messed and corrupt and you have a lot of problems..I recommend 10-15x for the fact that you may have a very unpleasant trip.