Phil,
I agree with Jay and wq3296. The older X-Acto handles are heavier and hold any X-Acto blade fast. Look for them at yard sales.
I have found that a better handle for scalpel blades is the Veritas Carvers Knife from Lee Valley (happy customer only).
David B has pointed out that both X-Acto and scalpel blades have a place in the tool box.
Paul