Yeah, Eternal Wands have two charges per day, so they're basically spell level x caster level x 800 to make.
Keep in mind though, the main consideration here is action economy. Activating an item such as a wand (command word etc.) takes up a standard action, meaning you're spending the first round of combat buffing up, so to speak.
You could also make an item that permanently gives haste, but that would be rather costly. Spell level x caster level x 2,000, but there's a catch:
quote:
If a continuous item has an effect based on a spell with a duration measured in rounds, multiply the cost by 4. If the duration of the spell is 1 minute/level, multiply the cost by 2, and if the duration is 10 minutes/level, multiply the cost by 1.5. If the spell has a 24-hour duration or greater, divide the cost in half.
Since Haste is a rounds/level spell, you'd be looking at a x4 price multiplier. Since number of rounds would no longer be a factor you could cut costs by getting a Summoner to cast it (level 2 spell for them) though the cost would still be 2 x 4 x 2,000 x 4 = 64k. There's a reason you don't see such items on everyone and their cousins at high levels.