why not check ebay? most of the people selling them in spindles on there also have online stores, and their ebay "buy it now" prices are usually $10 - $15 US$ cheaper than their online store prices. ebay prices can vary, but if you check around, competitive pricing can be found on there if you know what "competitive" is in first place;
also, some other stores i have seen selling dvd recordable media online :
(haven't bought from any of these personally...)
http://www.rima.com
http://www.shop4tech.com
http://www.esbuy.com
as a comparison, locally here (Canada), local stores are ripping everyone off in a major way for recordable DVD media.
one store has Optodisc 1x/2x media for $5 CAN$ each, or a spindle of 50 for $150 CAN$. Another store has Princo 1x discs for $7 CAN$ each, or $250 CAN$ for a spindle of 100; they also have Verbatim 2x discs for $13 CAN$ each. Another store sells Princo 1x discs for $2 CAN$ each when purchased in quantities of 10 or more (no jewel case -- paper envelope); they also have Princo or Ritek 4x discs for $5 CAN$ each when purchased in quantities of 10 or more, and they have spindles of 25 of the same discs for around $120 CAN$. Some other brands and varying pricing is available, but in general the pricing is all over the map.
You have to shop around, and best bet is to buy a spindle (from a reputable ebay or other seller), and either use the bulk load of discs yourself or else split them with a friend or neighbour. No matter what you sell spindle extras at to a friend, your price is almost sure to beat retail pricing.