it's not on all psp/ds... only THQ as said in other posts.
Now somebody just needs to find 2 copies of Electroplankton in one store.
and the 25% off used DS deal was much better for hunting Electroplankton.
a gamestop near me had a complete copy, so I bought it, and then after the coupon came, I got it price adjusted. With the cashier's screw up, I got it for about $37.
also, my local gamestop has a used cart-only copy now.