Live Aquaria will also do free shipping if your order is above $225. I don't know what size tank you are stocking, or what you are considering, but you can get there pretty fast. I can also vouch that they are pretty much no hassle when it comes to their guarantee. Just a phone call and your order number is all it took for me. No pictures, no mailing back a tail or any of that.
I have also ordered from saltwaterfish.com. I think their invertebrates are better than Live Aquaria, but that is truly anecdotal in my limited experience. They do free shipping if the total is more than $199. Also, they regularly have specials where your entire order will have free shipping if you order an item from a certain list. This list changes from day to day, but always includes their clean up crew packs. I ordered my ORA deresa clam this way. However, in order to get a refund for a DOA, you have to snap a picture and email it in within 5 hours of delviery. They will give you credit if you send in the picture after 5 hours but before 15 days. Also, if you just sign up for their email list, they'll send you a coupon code for 15% off regularly priced items. Subsequent emails may include a discount code or just list their sale items.
I would say I've had good experience with both of these companies.
It is a violation of federal law to use this product in a manner inconsistent with its labelling.