Price is quite understandable; while Jake has a really impressive shop with lost of very cool tools, doing the setup to cut triangles would take... a fair amount of time, plus the actual cutting time. Divide the value/cost of that time by a small number of sticks...$$s.Yes it is viable- they come at quite the price especially with specified densities. They shipped safely too.
Hope they work well for you.
BTW, from experience in 2011 w/ 3-leg, one of the really tricky things is is setting the load block up on a triangle so the legs end up equally loaded. The center of triangle is the intersection of the perpendicular lines drawn at midpoints of the triangle's sides. Need to align the center of the 5cm square (the load block) with the center of the triangle. We ended up solving this little problem by a) drawing (carefully, at full size) triangle at the outsides of the legs, with square (with triangle and square center points aligned), then making/cutting an 'alignment plate' off that drawing. We used 3/32 plexi; you could do it from 1/16 bass or balsa sheet; like 4cm wide, maybe 7cm long, with a 60 degree V cut into one end. Bring the plate into contact right at the top of the tower, with one leg at the apex of the V cut. Glued on the top side of the plate, you have 'guide sticks'- little pieces of 1/8 x 1/8 that align with/are positioned so they come right up against to sides of the load block. With plate against tower right at the top, adjust load block position till it its against the guide sticks.