Would you get pills or powder? I was considering pills because it would be easy to give out and pre-dosed accurately (we would hope) but powder gives me the flexibility to adjust personal doses albeit also requiring me to get an accurate mg scale.
So for a party, would you order pills or powder? Trying to keep it domestic and not enter into a state of despair and anguish over prices.
You should have a scale anyway (the $20 GEM-20 on amazon is perfectly suitable for mdma, just get one of those). Go with loose powder and weigh out doses into gelcaps for the party. Powder is cheaper and better for more accurate dosing, and you'll never really know everything that's in a pressed pill unless you have it lab tested.