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A pretty standard 15 watt solar panel which i am showing here mostly because it is available. The ICP panels i am familiar with seem to be in short supply, so this might be what i would buy if i needed one today.
The panel itself probably costs around $120. The larger four panel sunforce model shown in this gallery uses four of these panels.
You can currently find it for sale here as part of a kit (including charger) for $150. Perhaps other stores will carry it for less without charge controller.