Unfortunately I don't know much about this particular breed of roaches but the price sounds good to me. A 1000 roaches could go just as fast as a thousand crickets, if you have a dragon that is ravenously hungry and loves them. It really depends on the size. If they are all adults and a mix of males and females, they may be too big to feed your dragon (space between the dragons' eyes for size of feeder applies with roaches). Some roaches are very hard shelled when adults so are not a very good feeder for young dragons, even if small enough.
Some roaches climb and some roaches fly, some do both. Finding a non climbing flightless breed is usually the best way to go (much less chance to have them escape, other than dropping them). A 1000 certainly is a good size to start a large colony, but BDLvr is right in it being a better ideal to buy a smaller amount, to make sure your dragon likes them. It would be a real pain if you bought 1000 roaches and your dragon turns his nose at them. Unless you have other insect eating animals...it will mean you now have 1000 roaches to destroy or sell off. (don't release them..they could survive depending on your climate).
For more information about the rearing and care of these roaches, I suggest posting your question on the feeder forum. There are alot of roach experts there.
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PHLdyPayne