hc, everyone here just wants to see ya have a successful aquarium. Like Hara said, they are out to sell you anything, whereas we are not. It's a common problem, one you really aren't expected to know!
I can't find any info on this TLC stuff except that it's manufactured in Ohio. Since you are from Ohio, it's possible that maybe it's only distributed locally. I have never seen it in stores. I thought I read once, that if a product doesn't require refrigeration, it's not going to work, which makes complete sense.
As for the Bio-Spira, yes, it may work. But... the problem is when you want to try and add liverock to your system. It is going to possibly re-cycle anyways, unless you get totally 100% cured rock and take it directly from whereever you get it and put it right into your tank. Sinec you are still cycling the tank, it would be more beneficial for you to just get all of your liverock now, let it cure in your tank thus cycling it at the same time. This way, you know for sure your tank will have enough bacteria to support a bioload as heavy as liverock and fish, coral, etc. and you won't have to worry about mini-cycles and such.
This...
1. Saves you money
2. Ensures that your livestock will have NO problem living in your tank.
3. Eliminates the possibility of a mini-cycle by adding liverock later.
Liverock is such an important part of biological filtration. If you still wish to add the product, go ahead. But please also add your liverock at the same time, that will help greatly.
Hope this makes sense.