The throwing spikes are admirably cheap, but rather difficult to throw.
Most enthusiasts like rather large thowers; they're just easier to manage, and not so critical as to grip placement and so forth. I found a pair of "the worlds largest throwing knife" (modeled on the common "silver wing" design) in the Bud K catalogue for 12 bucks each.
Sadly, they don't seem to have them any more, though searching through some of the oriental MA suppliers sites may yield something.
(Might have been the only worthwhile thing in the entire catalogue, Bud K sells junk...)
Whatever you decide on, get two or three- you can do more throwing and less walking/picking up.
