buckyballs - cheap and expensive

nanodots $30-40 for $216

zen magnets (preferred?)  $26 for 216

zion magnets  $20 for 216

neocube $22 for 251

magnet balls $20 for 216 (lighter, less magnetic)

nanospheres $20 for 231
fair quality, good price

231 x 5 = 1,155 count

zen magnets (preferred?)  $26 for 216   out of stock?

zion magnets  $20 for 216  out of stock?

nanospheres 231/$20 = 11.6 BPD few reviews but all positive
magnet balls 216/$19 = 11.4 BPD  same size as buckyballs but weaker
buckyballs (silver) 216/$20 = 10.8 BPD
nanodots 216/$30 = 7.2 BPD   no spares, bad value

NeoCube Cube-Tastic Value Pack 251/$22 = 11.4 BPD  good reviews smaller/weaker than buckyballs
NeoCube Omega 1081/$78 = 13.8 BPD  good reviews smaller/weaker than buckyballs
cybercube 224/$26 = 8.6 BPD  flaking problems, smaller than buckyballs

all the black ones seem to have flaking problems

nanospheres 231/$20 = 11.6 BPD few reviews but all positive
lowest price at the highest quality
ordered 5

nanospheres are 5mm

how many do I have?  15 sets of 231 = 3,465 I think
nanospheres may no longer be available
any 5mm magnets are hard to find now, were they banned?