Is there any extension that allows to hide product prices and disable checkout for not logged in users?
Instructions on how to modify yourself:
http://www.magentocommerce.com/boards/viewthread/22673/
Look for the instructions posted by szotyi about halfway down the post. He does a nice job of walking you through the process.
Or, one you can buy:
http://www.magentocommerce.com/magento-connect/bolasevich/extension/2096/hide-product-price-for-non-registered-users
Finally, one that is even more expensive:
http://www.magentocommerce.com/magento-connect/Cart2Quote/extension/5905/not2order_hide_price_disable_ordering
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