How much should these grenades cost?

[SWAT]

I'm trying to merge the Dragonstar and Spycraft grenades, and I'm perplexed as to how much each type should cost. Spycraft budget points, in my experience, don't directly convert to gold pieces very well, and Dragonstar prices are much much too low. What I want to figure out is how much a given grenade would cost if it were a one-use magic item, as per the 3.5 magic item rules.

The chart I've come up with is here:
Grenades Chart

Does everything look reasonable? Thanks.

 

[Mustrum_Ridcully]

I'm trying to merge the Dragonstar and Spycraft grenades, and I'm perplexed as to how much each type should cost. Spycraft budget points, in my experience, don't directly convert to gold pieces very well, and Dragonstar prices are much much too low. What I want to figure out is how much a given grenade would cost if it were a one-use magic item, as per the 3.5 magic item rules.

The chart I've come up with is here:
Grenades Chart

Does everything look reasonable? Thanks.

I am not sure. The costs might be okay, though it is difficult to determine exactly. I don`t agree with the Saving Throw DCs, but that might be because I only remember the D20 Modern values. (Which are usually 15)
I think there is simple way to calculate it:
find a spell with a similar effect, and calculate the cost of a one-use magical item (potion rules)
Example: Fragmentation grenades deal 4d6 points of damage. This would be equivalent to a 3rd level spell, fireball (ignoring the damage die), with a higher saving throw DC (I take 15 like D20 Modern and calculate the spell as heightened), but a lower caster level (4)
Formula Cost: 4 x 4 x 50 gp => 800 gp for a fragmentation grenade.