A few things about mail order. As jeta indicated, Live Aquaria has high shipping costs but their packaging is unequaled. The cost of shipping is not based upon weight so agreed, buying more will be less "expensive" in the overall percentage of shipping cost to product cost. As for time of year, you are up in Maine so overnight, even with a heatpack when they first ship, isn't going to last but a few hours. If you are going to order, now is the time to do it. In a month or so, Maine will be under brrrrrrrrr temps
and it starts to get iffy in maintaining a good temp for the shipment. For example, I don't order anything live in the high summer just due to heat. With the delivery schedule the box may get out for delivery in the early AM but it sits in a hot truck all day.
Have someone at home on day of delivery or at least don't be far away. If I have fish arriving I am at home but if I am getting something like coral, I have the FEDEX people just tuck it inside my front door. I know my delivery schedule in my area and to date, I can always time the delivery with my normal time home from work within an hour....haven't missed in three years
Warranty or live arrive guarantee is important. Make sure the company is willing to offer the guarantee or in most cases, you will at least get a credit at the vendor...I have yet to see anyone, including Live Aquaria, refund money.