Steam bundles are now set to a 50 cents minimum price
According to the info that got posted in the Steamworks Development group:
" Enforcing average price minimum As we do with individual games, we have a minimum price for bundles to cover base transaction costs. This minimum wasn’t enforced until now, so it could be that some bundles that were previously visible and purchasable are no longer available to customers at their current price. As detailed in the Steam Bundles documentation, bundles will appear to customers in a currency as long as the average price per item in a bundle is at least the equivalent of $0.50. If the average price per item in the bundle is lower than that (due to discounting of individual items, the discount applied to the bundle, or due to a specific currency being much cheaper) the bundle will not be visible to customers in that currency. Information about which countries your bundle is visible in will be shown on your bundle administration page. "