The amazing thing is the fact that these are currently qualifying for More Beer's free shipping program. Under that program most orders of $59 ship for free. It's not common for heavy glass items, such as bottles, to qualify for flat rate or free shipping promos. So... this is a great deal.
Buy 5 cases and these ship for free. If my math is right, you'd need about 50 of these to bottle of 5 gallon batch. 5 cases, or 60 bottles would be enough for around a 6 gallon batch. Also check out the "you might also need" section on the product page for corkers, corks and hoods.
If you need a Belgian Style Beer to put in these puppies, check out Russian River's Consecration Kit.
Belgian Style Beer Bottles - Corkable (375mL) 12 Per Case B330 - $12.95 (Save 23%) + Free Shipping with a $59 order
EDIT: Those sold out within 15 minutes or so! The cappable version of those bottles are still in stock and also on sale. That version does not qualify for the free shipping promo.