The bottles cost $3.60 a piece (I think that is for the 8 oz. size), so you
do save money by getting the entire set for $29.99, if you need that many
colors. In case the link doesn't work, the name of the product is Watercolor
Magic. It is by Sargent Art. I was so very excited when I found these at our
local P&S store...they were exactly what I needed for that second grade
spray project, as the painted provided by the PTA for that lesson were
tempera paints that did NOT spray well, even watered down.
I have read that liquid watercolors do not stand the test of time. I have
not used these long enough to know of their fade rate. But I thought I'd
caution you on what I've read (though I had not read it about this brand
specifically).
I hope this is helpful to you! And that you have FUN exoerimenting!