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Solar IS expensive, there's no way around that. If you are going to be taking the battery home and back to recharge it, get an AGM battery so there's no problem with acid spilling.
You can expect that most solar panels will put out about four hours worth of their rated capacity, given a full day of sunlight. So if the panel is rated 25 watts--you may get 100 watt hours (about 7 amp-hours) of power on a sunny summer day. Make sure that if you do go solar, the panels are warranteed for marine and exterior use, otherwise they will be destroyed by water penetration. The cheap "keep the car charged" panels usually have to be kept sheltered, even rain will kill most of them.
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