Rebecca, I remember a previous post that a visitor found storage at the bus station, so I called to see if still available, and it is. Lockers are $3 for the first hour and $1 per hour after that. It's difficult to find storage short term because of security/liability, esp. since 9/11. If you are staying at a hotel, they will often keep your luggage for you short term.
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Double- and triple-tier lockers also work well in other parts of a school. You might want to consider installing some in the teachers' lounge. This convenient addition will enable educators to store their personal belongings throughout the day, rather than having to carry them around. Ordering metal lockers for your employees will demonstrate that you care about their comfort and convenience. Lockers Denver Colorado