well i did a comparison of having TM shipped to your door or going down to petco with the internet price in hand and hauling a bucket home and per gallon the TM wasnt double.
Heres what i added up:
I was checking with fosters & smith, they have tropic marine pro for $64.99 and Regular TM for $57.99 if the order is over $240 the shipping is only $15.99 so if say a few guys put an order in for 4 buckets thats only $61.98 a bucket for 200 gal. mix.
I see a lot of people use IO, but if you want to step up to a better quality "reef" salt i think ordering from them is really a great deal. Note: your getting 40 more gallons out of the TM too also.
If you print the coupon, drive down to petsmart and get the "deal" like Crit pointed out. its 21¢ per gallon for IO. If you dont print it out and pay regular retail its actually more expensive than having Tropic Marin delivered to your door! I would have never thought.
If you have the TM delivered to your door its 31¢ per gallon. Just thought I'd try a little math and see what the difference really is.
I'm not trying to make this a IO versus TM debate (why bother) just throwing a little comparison out there
Chris"
So see its not more expensive necessarily, depends on where and how you buy it.