I have Telenav on my Sprint 8703e for $10/month. I think you can access Telenav on the Sprint PCS Vision plan for $2.99 for a 24 hour period. I don't use/need it very often but when I need it I need it.

Anybody know if that's an option on Sprint's RIM data plan? I've tried sorting through the Sprint docs and can't tell.

There is only one BB data plan - $39.99.