S. hispanica is also know as chia, as in Chia Pets. We're getting to that time of year when you start seeing them pop up in stores as a last-minute holiday gift ideas. I don't know anyone who have taken these seriously - I'm sure I know some MGs that did - but when we planned to give one as a gag gift a few years ago, the temptation was too much and I had to buy one for myself.
website recommends other seeds you could use when your supply of chia seeds runs out, but they contradict themselves on another page by recommending against some of those same seeds because they don't germinate quickly enough. More research may be required on this subject.
Recommendations if you really want to grow these:
1. Follow the instructions - Water seeps out of the planter constantly. You will need to dump the water from the collection tray every day and top off the planter.
2. Chia is a flowering herb, so it needs a lot of sunlight. Make sure you have a good place for it.
3. Expectations - Like anything you buy from toys to food, it's not going to look as good as what's on the box.
If you're ok with everything I just mentioned, then I wish you luck. After writing all of this, I think I might have to try it again, but I'll be waiting until spring.